diff --git a/README.md b/README.md
index 3958b29..ddcb80b 100644
--- a/README.md
+++ b/README.md
@@ -68,8 +68,14 @@ The options are described below.
 
 ### `source: string`
 
-Set the source code to be edited with the `source` getter, and get the current source with the `source` setter. Note
-that setting the source will reset the editor state (including undo and redo history).
+Get the source code to be edited with the `source` getter, and set the current source with the `source` setter. Note
+that setting the source will only update the code shown with the new contents, and the editor state will be maintained
+(including undo and redo history). If the intent is to reset the state with a new document use the `newSource` method
+instead.
+
+### `newSource(doc: string): void`
+
+Set the source code to be edited in the editor. This resets the editor state, and loads the new code.
 
 ### `setLanguage(languageName: string): Promise<void>`
 
diff --git a/package-lock.json b/package-lock.json
index 5b19271..370b6ab 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "@openwebwork/pg-codemirror-editor",
-    "version": "0.0.1-beta.9",
+    "version": "0.0.1-beta.10",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "@openwebwork/pg-codemirror-editor",
-            "version": "0.0.1-beta.9",
+            "version": "0.0.1-beta.10",
             "license": "MIT",
             "dependencies": {
                 "@codemirror/lang-html": "^6.4.9",
@@ -5715,9 +5715,9 @@
             }
         },
         "node_modules/typescript": {
-            "version": "5.6.2",
-            "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.6.2.tgz",
-            "integrity": "sha512-NW8ByodCSNCwZeghjN3o+JX5OFH0Ojg6sadjEKY4huZ52TqbJTJnDo5+Tw98lSy63NZvi4n+ez5m2u5d4PkZyw==",
+            "version": "5.5.4",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
+            "integrity": "sha512-Mtq29sKDAEYP7aljRgtPOpTvOfbwRWlS6dPRzwjdE+C0R4brX/GUyhHSecbHMFLNBLcJIPt9nl9yG5TZ1weH+Q==",
             "dev": true,
             "license": "Apache-2.0",
             "bin": {
diff --git a/package.json b/package.json
index ad1f42b..e7069ef 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@openwebwork/pg-codemirror-editor",
-    "version": "0.0.1-beta.9",
+    "version": "0.0.1-beta.10",
     "description": "PG CodeMirror Editor",
     "author": "The WeBWorK Project",
     "license": "MIT",
diff --git a/public/editor.js b/public/editor.js
index 9ef062d..1bdd324 100644
--- a/public/editor.js
+++ b/public/editor.js
@@ -17,7 +17,7 @@ if (codeMirrorElt instanceof HTMLElement) {
             reader.readAsText(file);
             reader.addEventListener('load', () => {
                 sourceInput.value = reader.result;
-                pgEditor.source = sourceInput.value;
+                pgEditor.newSource(sourceInput.value);
             });
         }
     });
diff --git a/src/pg-codemirror-editor.ts b/src/pg-codemirror-editor.ts
index 623f922..7e7dd00 100644
--- a/src/pg-codemirror-editor.ts
+++ b/src/pg-codemirror-editor.ts
@@ -330,16 +330,20 @@ export class View {
     }
 
     set source(doc: string) {
-        this.view.setState(EditorState.create({ doc, extensions: this.extensions }));
-        void this.setLanguage(this.currentLanguage);
-        void this.setTheme(this.currentTheme);
-        void this.setKeyMap(this.currentKeyMap);
+        this.view.dispatch({ changes: { from: 0, to: this.view.state.doc.length, insert: doc } });
     }
 
     get source() {
         return this.view.state.doc.toString();
     }
 
+    newSource(doc: string) {
+        this.view.setState(EditorState.create({ doc, extensions: this.extensions }));
+        void this.setLanguage(this.currentLanguage);
+        void this.setTheme(this.currentTheme);
+        void this.setKeyMap(this.currentKeyMap);
+    }
+
     async setLanguage(languageName: string) {
         const language = this.languages.get(languageName);
         if (language) {