diff --git a/src/main/java/org/billthefarmer/editor/Editor.java b/src/main/java/org/billthefarmer/editor/Editor.java
index 77f5fee..0e5676d 100644
--- a/src/main/java/org/billthefarmer/editor/Editor.java
+++ b/src/main/java/org/billthefarmer/editor/Editor.java
@@ -44,6 +44,7 @@
 import android.print.PrintAttributes;
 import android.print.PrintDocumentAdapter;
 import android.print.PrintManager;
+import android.support.v4.content.FileProvider;
 import android.text.Editable;
 import android.text.Html;
 import android.text.InputType;
@@ -67,7 +68,6 @@
 import android.view.SubMenu;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.ViewTreeObserver;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodManager;
 import android.webkit.WebView;
@@ -81,12 +81,10 @@
 import android.widget.SeekBar;
 import android.widget.TextView;
 
-import android.support.v4.content.FileProvider;
-
 import com.ibm.icu.text.CharsetDetector;
 import com.ibm.icu.text.CharsetMatch;
 
-import org.commonmark.node.*;
+import org.commonmark.node.Node;
 import org.commonmark.parser.Parser;
 import org.commonmark.renderer.html.HtmlRenderer;
 
@@ -96,30 +94,21 @@
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
-import java.io.FileReader;
 import java.io.FileWriter;
-import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
-import java.io.Reader;
-
 import java.lang.ref.WeakReference;
-
 import java.nio.charset.Charset;
-
 import java.text.DateFormat;
-
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
-
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -146,6 +135,7 @@ public class Editor extends Activity
     public final static String PREF_THEME = "pref_theme";
     public final static String PREF_TYPE = "pref_type";
     public final static String PREF_WRAP = "pref_wrap";
+    public final static String PREF_LINE_NUMBERS = "pref_line_numbers";
 
     public final static String DOCUMENTS = "Documents";
     public final static String FOLDER = "Folder";
@@ -428,6 +418,7 @@ public class Editor extends Activity
     private MenuItem searchItem;
     private SearchView searchView;
     private ScrollView scrollView;
+    private LineNumbersTextView lineNumbersView;
     private Runnable updateHighlight;
     private Runnable updateWordCount;
 
@@ -445,6 +436,7 @@ public class Editor extends Activity
     private boolean view = false;
 
     private boolean wrap = false;
+    private boolean lineNumbers = false;
     private boolean suggest = true;
 
     private boolean changed = false;
@@ -456,6 +448,8 @@ public class Editor extends Activity
     private int type = MONO;
 
     private int syntax;
+    private long highlightRefreshTime = 0; // Syntax highlighting refresh time on scroll changed
+    private long lineNumbersRefreshTime = 0; // Line numbers refresh time on scroll changed
 
     // onCreate
     @Override
@@ -474,6 +468,7 @@ protected void onCreate(Bundle savedInstanceState)
         view = preferences.getBoolean(PREF_VIEW, true);
         last = preferences.getBoolean(PREF_LAST, false);
         wrap = preferences.getBoolean(PREF_WRAP, false);
+        lineNumbers = preferences.getBoolean(PREF_LINE_NUMBERS, false);
         suggest = preferences.getBoolean(PREF_SUGGEST, true);
         highlight = preferences.getBoolean(PREF_HIGH, false);
 
@@ -561,6 +556,10 @@ else if (!suggest)
 
         setSizeAndTypeface(size, type);
 
+        lineNumbersView = findViewById(R.id.lineNumbersView);
+        lineNumbersView.setEditText(textView);
+        lineNumbersView.setLineNumbersEnabled(lineNumbers);
+
         Intent intent = getIntent();
         Uri uri = intent.getData();
 
@@ -755,8 +754,15 @@ public void onTextChanged(CharSequence s,
             // onScrollChange
             scrollView.getViewTreeObserver().addOnScrollChangedListener(() ->
             {
-                if (updateHighlight != null)
-                {
+                final long time = System.currentTimeMillis();
+
+                if (lineNumbers && time - lineNumbersRefreshTime > 125) {
+                    lineNumbersRefreshTime = time;
+                    lineNumbersView.forceRefresh();
+                }
+
+                if (updateHighlight != null && time - highlightRefreshTime > 125) {
+                    highlightRefreshTime = time;
                     textView.removeCallbacks(updateHighlight);
                     textView.postDelayed(updateHighlight, UPDATE_DELAY);
                 }
@@ -826,6 +832,7 @@ public void onPause()
         editor.putBoolean(PREF_VIEW, view);
         editor.putBoolean(PREF_LAST, last);
         editor.putBoolean(PREF_WRAP, wrap);
+        editor.putBoolean(PREF_LINE_NUMBERS, lineNumbers);
         editor.putBoolean(PREF_SUGGEST, suggest);
         editor.putBoolean(PREF_HIGH, highlight);
 
@@ -907,6 +914,7 @@ public boolean onPrepareOptionsMenu(Menu menu)
         menu.findItem(R.id.openLast).setChecked(last);
         menu.findItem(R.id.autoSave).setChecked(save);
         menu.findItem(R.id.wrap).setChecked(wrap);
+        menu.findItem(R.id.lineNumbers).setChecked(lineNumbers);
         menu.findItem(R.id.suggest).setChecked(suggest);
         menu.findItem(R.id.highlight).setChecked(highlight);
 
@@ -1080,6 +1088,9 @@ public boolean onOptionsItemSelected(MenuItem item)
         case R.id.wrap:
             wrapClicked(item);
             break;
+        case R.id.lineNumbers:
+            lineNumbersClicked(item);
+            break;
         case R.id.suggest:
             suggestClicked(item);
             break;
@@ -1766,14 +1777,17 @@ public void onProgressChanged(SeekBar seekBar,
             {
                 if (fromUser)
                     listener.onProgressChanged(seekBar, progress);
+
+                if (lineNumbers) {
+                    lineNumbersView.forceRefresh();
+                }
             }
 
             @Override
             public void onStartTrackingTouch (SeekBar seekBar) {}
 
             @Override
-            public void onStopTrackingTouch (SeekBar seekBar)
-            {
+            public void onStopTrackingTouch (SeekBar seekBar) {
                 dialog.dismiss();
             }
         });
@@ -1815,8 +1829,7 @@ public void onPageFinished(WebView view, String url)
             }
         });
 
-        String htmlDocument = 
-            HTML_HEAD + Html.toHtml(textView.getText()) + HTML_TAIL;
+        String htmlDocument = HTML_HEAD + Html.toHtml(textView.getText()) + HTML_TAIL;
         webView.loadData(htmlDocument, TEXT_HTML, UTF_8);
     }
 
@@ -1894,6 +1907,14 @@ private void wrapClicked(MenuItem item)
         recreate(this);
     }
 
+    // lineNumbersClicked
+    private void lineNumbersClicked(MenuItem item)
+    {
+        lineNumbers = !lineNumbers;
+        item.setChecked(lineNumbers);
+        lineNumbersView.setLineNumbersEnabled(lineNumbers);
+    }
+
     // suggestClicked
     private void suggestClicked(MenuItem item)
     {
@@ -3562,7 +3583,7 @@ protected List<File> doInBackground(String... params)
                 File entry = new File(path);
                 entries.add(entry);
             }
- 
+
             // Check the entries
             for (File file : entries)
             {
diff --git a/src/main/java/org/billthefarmer/editor/LineNumbersTextView.java b/src/main/java/org/billthefarmer/editor/LineNumbersTextView.java
new file mode 100644
index 0000000..d1f7c05
--- /dev/null
+++ b/src/main/java/org/billthefarmer/editor/LineNumbersTextView.java
@@ -0,0 +1,293 @@
+package org.billthefarmer.editor;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.text.Editable;
+import android.text.Layout;
+import android.text.TextWatcher;
+import android.util.AttributeSet;
+import android.widget.EditText;
+import android.widget.TextView;
+
+/**
+ * @author Li Guanglin
+ */
+public class LineNumbersTextView extends TextView {
+    private boolean lineNumbersEnabled;
+    private LineNumbersDrawer lineNumbersDrawer;
+
+    public LineNumbersTextView(Context context) {
+        super(context);
+    }
+
+    public LineNumbersTextView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public LineNumbersTextView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+        if (lineNumbersEnabled) {
+            lineNumbersDrawer.draw(canvas);
+        }
+    }
+
+    public void forceRefresh() {
+        setText(""); // Use setText("") to activate LineNumbersTextView refresh
+    }
+
+    public void setEditText(final EditText editText) {
+        lineNumbersDrawer = new LineNumbersDrawer(editText, this);
+    }
+
+    public void setLineNumbersEnabled(final boolean enabled) {
+        lineNumbersEnabled = enabled;
+        if (lineNumbersEnabled) {
+            lineNumbersDrawer.prepare();
+        } else {
+            lineNumbersDrawer.reset();
+        }
+    }
+
+    // public boolean isLineNumbersEnabled() { return lineNumbersEnabled; }
+
+    static class LineNumbersDrawer {
+        public final EditText editText;
+        public final LineNumbersTextView textView;
+
+        private final Paint paint = new Paint();
+
+        private static final int NUMBER_PADDING_LEFT = 1;
+        private static final int NUMBER_PADDING_RIGHT = 12;
+
+        private final Rect visibleArea = new Rect();
+        private final Rect lineNumbersArea = new Rect();
+
+        private int fenceX;
+        private int numberX;
+        private int maxNumber = 1; // To gauge the width of line numbers fence
+        private int maxNumberDigits;
+        private int lastMaxNumber;
+        private int lastLayoutLineCount;
+        private float lastTextSize;
+
+        private final int[] startLine = {0, 1}; // {line index, actual line number}
+
+        private final TextWatcher lineTrackingWatcher = new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+                maxNumber -= countLines(s, start, start + count);
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                maxNumber += countLines(s, start, start + count);
+            }
+
+            @Override
+            public void afterTextChanged(Editable editable) {
+                if (isLayoutLineCountChanged() || isMaxNumberChanged()) {
+                    textView.forceRefresh();
+                }
+            }
+        };
+
+        public LineNumbersDrawer(final EditText editText, final LineNumbersTextView textView) {
+            this.editText = editText;
+            this.textView = textView;
+            paint.setColor(0xFF999999);
+            paint.setTextAlign(Paint.Align.RIGHT);
+        }
+
+        private boolean isOutOfLineNumbersArea() {
+            final int margin = (int) (visibleArea.height() * 0.5f);
+            final int top = visibleArea.top - margin;
+            final int bottom = visibleArea.bottom + margin;
+
+            if (top < lineNumbersArea.top || bottom > lineNumbersArea.bottom) {
+                // Set line numbers area
+                // height of line numbers area = (1.5 + 1 + 1.5) * height of visible area
+                lineNumbersArea.top = top - visibleArea.height();
+                lineNumbersArea.bottom = bottom + visibleArea.height();
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        private boolean isTextSizeChanged() {
+            if (editText.getTextSize() == lastTextSize) {
+                return false;
+            } else {
+                lastTextSize = editText.getTextSize();
+                paint.setTextSize(lastTextSize);
+                return true;
+            }
+        }
+
+        private boolean isMaxNumberChanged() {
+            if (maxNumber == lastMaxNumber) {
+                return false;
+            } else {
+                lastMaxNumber = maxNumber;
+                return true;
+            }
+        }
+
+        private boolean isMaxNumberDigitsChanged() {
+            int digits;
+            if (maxNumber < 10) {
+                digits = 1;
+            } else if (maxNumber < 100) {
+                digits = 2;
+            } else if (maxNumber < 1000) {
+                digits = 3;
+            } else if (maxNumber < 10000) {
+                digits = 4;
+            } else {
+                digits = 5;
+            }
+
+            if (digits == maxNumberDigits) {
+                return false;
+            }
+
+            maxNumberDigits = digits;
+            return true;
+        }
+
+        private boolean isLayoutLineCountChanged() {
+            final Layout layout = editText.getLayout();
+            if (layout == null) {
+                return true;
+            }
+
+            final int lineCount = layout.getLineCount();
+            if (lineCount == lastLayoutLineCount) {
+                return false;
+            } else {
+                lastLayoutLineCount = lineCount;
+                return true;
+            }
+        }
+
+        private int countLines(final CharSequence s, int start, int end) {
+            int count = 0;
+            for (; start < end; start++) {
+                if (s.charAt(start) == '\n') {
+                    count++;
+                }
+            }
+            return count;
+        }
+
+        private void lineTracking(boolean enabled) {
+            editText.removeTextChangedListener(lineTrackingWatcher);
+
+            if (enabled) {
+                maxNumber = 1;
+                final CharSequence text = editText.getText();
+                if (text != null) {
+                    maxNumber += countLines(text, 0, text.length());
+                }
+                editText.addTextChangedListener(lineTrackingWatcher);
+            }
+        }
+
+        /**
+         * Prepare for drawing line numbers.
+         */
+        public void prepare() {
+            lineTracking(true);
+            textView.setVisibility(VISIBLE);
+        }
+
+        /**
+         * Draw line numbers.
+         *
+         * @param canvas The canvas on which the line numbers will be drawn.
+         */
+        public void draw(final Canvas canvas) {
+            if (!editText.getLocalVisibleRect(visibleArea)) {
+                return;
+            }
+
+            final CharSequence text = editText.getText();
+            final Layout layout = editText.getLayout();
+            if (text == null || layout == null) {
+                return;
+            }
+
+            // If text size or the max line number of digits changed, update related variables
+            if (isTextSizeChanged() || isMaxNumberDigitsChanged()) {
+                numberX = NUMBER_PADDING_LEFT + (int) paint.measureText(String.valueOf(maxNumber));
+                fenceX = numberX + NUMBER_PADDING_RIGHT;
+                textView.setWidth(fenceX + 1);
+            }
+
+            // If current visible area is out of current line numbers area,
+            // will recalculate the start line
+            boolean invalid = false;
+            if (isOutOfLineNumbersArea()) {
+                invalid = true;
+                startLine[0] = 0;
+                startLine[1] = 1;
+            }
+
+            // Draw right border of the fence
+            canvas.drawLine(fenceX, lineNumbersArea.top, fenceX, lineNumbersArea.bottom, paint);
+
+            // Draw line numbers
+            int i = startLine[0];
+            int number = startLine[1];
+            int y = layout.getLineBaseline(i);
+            final int count = layout.getLineCount();
+            final int offsetY = editText.getPaddingTop();
+
+            if (y > lineNumbersArea.top) {
+                if (invalid) {
+                    invalid = false;
+                    startLine[0] = i;
+                    startLine[1] = number;
+                }
+                canvas.drawText(String.valueOf(number), numberX, layout.getLineBaseline(i) + offsetY, paint);
+            }
+            i++;
+            number++;
+
+            for (; i < count; i++) {
+                if (text.charAt(layout.getLineStart(i) - 1) == '\n') {
+                    y = layout.getLineBaseline(i);
+                    if (y > lineNumbersArea.top) {
+                        if (invalid) {
+                            invalid = false;
+                            startLine[0] = i;
+                            startLine[1] = number;
+                        }
+                        canvas.drawText(String.valueOf(number), numberX, y + offsetY, paint);
+                        if (y > lineNumbersArea.bottom) {
+                            break;
+                        }
+                    }
+                    number++;
+                }
+            }
+        }
+
+        /**
+         * Reset states related line numbers.
+         */
+        public void reset() {
+            lineTracking(false);
+            maxNumberDigits = 0;
+            textView.setWidth(0);
+            textView.setVisibility(GONE);
+        }
+    }
+}
diff --git a/src/main/res/layout/edit.xml b/src/main/res/layout/edit.xml
index 81b08d7..98d7fbf 100644
--- a/src/main/res/layout/edit.xml
+++ b/src/main/res/layout/edit.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/vscroll"
     android:layout_width="match_parent"
@@ -10,22 +9,37 @@
     android:layout_marginBottom="8dp"
     android:fillViewport="true">
 
-  <HorizontalScrollView
-      android:id="@+id/hscroll"
-      android:layout_width="match_parent"
-      android:layout_height="wrap_content"
-      android:fillViewport="true"
-      tools:ignore="LabelFor">
-
-    <EditText
-        android:id="@+id/text"
-        android:layout_width="wrap_content"
+    <LinearLayout
+        android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:gravity="top"
-        android:inputType="text|textMultiLine"
-        android:typeface="monospace"
-        tools:ignore="Autofill" />
+        android:orientation="horizontal">
+
+        <org.billthefarmer.editor.LineNumbersTextView
+            android:id="@+id/lineNumbersView"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_weight="0"
+            android:text="" />
+
+        <HorizontalScrollView
+            android:id="@+id/hscroll"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="0"
+            android:fillViewport="true"
+            tools:ignore="LabelFor">
+
+            <EditText
+                android:id="@+id/text"
+                android:layout_width="wrap_content"
+                android:layout_height="match_parent"
+                android:gravity="top"
+                android:inputType="text|textMultiLine"
+                android:typeface="monospace"
+                tools:ignore="Autofill" />
+
+        </HorizontalScrollView>
 
-  </HorizontalScrollView>
+    </LinearLayout>
 
 </ScrollView>
diff --git a/src/main/res/layout/wrap.xml b/src/main/res/layout/wrap.xml
index 8205192..80bd57c 100644
--- a/src/main/res/layout/wrap.xml
+++ b/src/main/res/layout/wrap.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/vscroll"
     android:layout_width="match_parent"
@@ -11,13 +10,27 @@
     android:fillViewport="true"
     tools:ignore="LabelFor">
 
-  <EditText
-      android:id="@+id/text"
-      android:layout_width="match_parent"
-      android:layout_height="wrap_content"
-      android:gravity="top"
-      android:inputType="text|textMultiLine"
-      android:typeface="monospace"
-      tools:ignore="Autofill" />
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="horizontal">
+
+        <org.billthefarmer.editor.LineNumbersTextView
+            android:id="@+id/lineNumbersView"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_weight="0"
+            android:text="" />
+
+        <EditText
+            android:id="@+id/text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="top"
+            android:inputType="text|textMultiLine"
+            android:typeface="monospace"
+            tools:ignore="Autofill" />
+
+    </LinearLayout>
 
 </ScrollView>
diff --git a/src/main/res/menu/main.xml b/src/main/res/menu/main.xml
index 656f01a..85aa6c2 100644
--- a/src/main/res/menu/main.xml
+++ b/src/main/res/menu/main.xml
@@ -105,6 +105,11 @@
           android:checkable="true"
           android:showAsAction="never"
           android:title="@string/wrap" />
+      <item
+          android:id="@+id/lineNumbers"
+          android:checkable="true"
+          android:showAsAction="never"
+          android:title="@string/lineNumbers" />
       <item
           android:id="@+id/suggest"
           android:checkable="true"
diff --git a/src/main/res/values-zh-rCN/strings.xml b/src/main/res/values-zh-rCN/strings.xml
index b59aded..8b908a9 100644
--- a/src/main/res/values-zh-rCN/strings.xml
+++ b/src/main/res/values-zh-rCN/strings.xml
@@ -1,79 +1,83 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 
-  <string name="appName">编辑器</string>
+    <string name="appName">编辑器</string>
 
-  <string name="newFile">新</string>
-  <string name="openFile">打开文件</string>
-  <string name="name">名字</string>
-  <string name="path">路径</string>
-  <string name="create">创造</string>
-  <string name="edit">编辑</string>
-  <string name="view">查看</string>
-  <string name="open">打开文件…</string>
-  <string name="save">保存</string>
-  <string name="storage">存储空间</string>
-  <string name="openRecent">打开最近文本</string>
-  <string name="clearList">清除列表</string>
-  <string name="search">查找…</string>
-  <string name="findAll">全局搜索…</string>
-  <string name="saveAs">保存为…</string>
-  <string name="detect">检测</string>
-  <string name="goTo">转到…</string>
-  <string name="print">打印…</string>
-  <string name="viewMarkdown">查看 Markdown…</string>
-  <string name="options">选项</string>
-  <string name="viewFile">查看文件</string>
-  <string name="openLast">最后打开</string>
-  <string name="autoSave">自动保存</string>
-  <string name="wrap">自动换行</string>
-  <string name="suggest">建议</string>
-  <string name="highlight">突出显示语法</string>
-  <string name="theme">主题</string>
-  <string name="light">亮</string>
-  <string name="dark">暗</string>
-  <string name="system">系统</string>
-  <string name="white">白</string>
-  <string name="black">黑色的</string>
-  <string name="retro">复古</string>
-  <string name="size">文本大小</string>
-  <string name="small">小</string>
-  <string name="medium">中</string>
-  <string name="large">大</string>
-  <string name="typeface">字体</string>
-  <string name="mono">等宽</string>
-  <string name="normal">变宽</string>
-  <string name="sans">无衬线</string>
-  <string name="serif">衬线</string>
-  <string name="about">关于</string>
+    <string name="newFile">新建文件</string>
+    <string name="openFile">打开文件</string>
+    <string name="name">名称</string>
+    <string name="path">路径</string>
+    <string name="create">创建</string>
+    <string name="edit">编辑</string>
+    <string name="view">查看</string>
+    <string name="open">打开</string>
+    <string name="save">保存</string>
+    <string name="storage">存储</string>
+    <string name="openRecent">打开最近</string>
+    <string name="clearList">清除列表</string>
+    <string name="search">查找</string>
+    <string name="findAll">查找全部</string>
+    <string name="saveAs">另存为</string>
+    <string name="detect">检测</string>
+    <string name="goTo">转到</string>
+    <string name="print">打印</string>
+    <string name="viewMarkdown">查看 Markdown</string>
+    <string name="options">选项</string>
+    <string name="viewFile">查看文件</string>
+    <string name="openLast">打开最后</string>
+    <string name="autoSave">自动保存</string>
+    <string name="wrap">自动换行</string>
+    <string name="lineNumbers">行号</string>
+    <string name="suggest">建议</string>
+    <string name="highlight">语法高亮</string>
+    <string name="theme">主题</string>
+    <string name="light">明亮</string>
+    <string name="dark">黑暗</string>
+    <string name="system">系统</string>
+    <string name="white">白色</string>
+    <string name="black">黑色</string>
+    <string name="retro">复古</string>
+    <string name="size">文本大小</string>
+    <string name="small">小</string>
+    <string name="medium">中</string>
+    <string name="large">大</string>
+    <string name="typeface">字体</string>
+    <string name="mono">等宽</string>
+    <string name="normal">比例</string>
+    <string name="sans">无衬线</string>
+    <string name="serif">衬线</string>
+    <string name="about">关于</string>
 
-  <string name="version" formatted="false"><a
-  href="https://github.com/billthefarmer/editor/releases/latest">%s</a>\n\n
-  编译时间 %s\n\n版权 \u00A9 2017 Bill Farmer\n\n中文（简体）译者<a
-  href="https://github.com/ludoux">Lu Chang (ludoux)</a>\n\n开源协议<a
-  href="https://www.gnu.org/licenses/gpl.txt">GNU GPLv3</a>
-  </string>
+    <string name="version" formatted="false">
+        <a href="https://github.com/billthefarmer/editor/releases/latest">%s</a>\n\n
+        编译时间 %s\n\n
+        Copyright \u00A9 2017 Bill Farmer\n\n
+        简体中文译者\n
+        <a href="https://github.com/ludoux">Lu Chang (ludoux)</a>\n
+        <a href="https://github.com/guanglinn">Li Guanglin</a>\n\n
+        开源协议 <a href="https://www.gnu.org/licenses/gpl.txt">GNU GPLv3</a>
+    </string>
 
-  <string name="tooLarge">太大了 %s</string>
-  <string name="choose">选择一个文件</string>
-  <string name="loading">加载中…</string>
+    <string name="tooLarge">过大 %s</string>
+    <string name="choose">选择</string>
+    <string name="loading">加载中</string>
 
-  <string name="modified">
-    你有未保存的更改。你想保存这些更改吗？
-  </string>
+    <string name="modified">
+        有未保存的更改。是否保存更改？
+    </string>
 
-  <string name="changedReload">
-    文件已被更改，你想重载它吗？
-  </string>
+    <string name="changedReload">
+        文件已被更改，是否重新加载？
+    </string>
 
-  <string name="changedOverwrite">
-    文件已被更改，你想覆写它吗？
+    <string name="changedOverwrite">
+        文件已被更改，是否覆盖写入？
   </string>
 
-  <string name="ok">OK</string>
-  <string name="reload">重载</string>
-  <string name="overwrite">覆写</string>
-  <string name="discard">放弃更改</string>
-  <string name="cancel">取消</string>
+    <string name="ok">OK</string>
+    <string name="reload">重载</string>
+    <string name="overwrite">覆写</string>
+    <string name="discard">丢弃</string>
+    <string name="cancel">取消</string>
 
 </resources>
diff --git a/src/main/res/values/strings.xml b/src/main/res/values/strings.xml
index 9d540e0..295ef51 100644
--- a/src/main/res/values/strings.xml
+++ b/src/main/res/values/strings.xml
@@ -30,6 +30,7 @@
   <string name="openLast">Open last</string>
   <string name="autoSave">Auto save</string>
   <string name="wrap">Word wrap</string>
+  <string name="lineNumbers">Line numbers</string>
   <string name="suggest">Suggestions</string>
   <string name="highlight">Highlight syntax</string>
   <string name="theme">Theme</string>