diff --git a/INSTALL.md b/INSTALL.md
index ba35169a7..9c9395a77 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -9,7 +9,8 @@ Download third-party libraries: `boost(>=1.60.0)`
 
 Optional:
 install `bash` (available via Git for Windows) for installing data files from `plum`;
-install `python` for building OpenCC dictionaries.
+install `python` for building OpenCC dictionaries;
+install [NSIS](http://nsis.sourceforge.net/Download) for creating installer.
 
 ## Checkout source code
 
@@ -35,7 +36,7 @@ set BOOST_ROOT=X:\path\to\boost_N_NN_N
 
 Alternatively, save your build environment settings in `env.bat`.
 You can create the file by copying `env.bat.template` and make modifications.
-Make sure `BOOST_ROOT` is set to existing `X:\path\to\boost_N_NN_N` in your copy.
+Make sure `BOOST_ROOT` is set to existing `X:\path\to\boost_<version_number>` in your copy.
 
 ### Build
 
@@ -46,6 +47,8 @@ build.bat all
 
 Voila.
 
+Installer will be generated in `output\archives` directory.
+
 ### Alternative: using prebuilt Rime binaries
 
 If you've already got a copy of prebuilt binaries of librime,
@@ -76,11 +79,3 @@ copy /Y build\lib\Release\rime.dll build\bin\
 cd build\bin
 echo zhongzhouyunshurufa | Release\rime_api_console.exe > output.txt
 ```
-
-### Create installer packages
-
-To create installer packages, you need to download and install [Unicode NSIS] (https://github.com/jimpark/unsis/releases).
-
-Then go to `output` directory, right-click and choose "Compile Unicode NSIS Script" with `install.nsi`.
-
-Installers will be generated in `output\archives` directory.
diff --git a/appveyor.after_build.bat b/appveyor.after_build.bat
deleted file mode 100644
index f01158562..000000000
--- a/appveyor.after_build.bat
+++ /dev/null
@@ -1,10 +0,0 @@
-setlocal
-
-"C:\Program Files (x86)\NSIS\makensis.exe" output\install.nsi
-if %ERRORLEVEL% NEQ 0 goto ERROR
-
-:ERROR
-set EXITCODE=%ERRORLEVEL%
-
-:EXIT
-exit /b %EXITCODE%
diff --git a/appveyor.yml b/appveyor.yml
index 8d681185c..82e603ab4 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -21,10 +21,7 @@ install:
   - .\appveyor.install.bat
 
 build_script:
-  - .\build.bat data hant
-
-after_build:
-  - appveyor.after_build.bat
+  - .\build.bat data hant installer
 
 artifacts:
   - path: output\archives\weasel-0.11.0.0-installer.exe
diff --git a/build.bat b/build.bat
index 7e75c2b4e..9de45bba4 100644
--- a/build.bat
+++ b/build.bat
@@ -33,6 +33,7 @@ set build_boost=0
 set build_data=0
 set build_hant=0
 set build_rime=0
+set build_installer=0
 set build_x64=1
 
 :parse_cmdline_options
@@ -43,11 +44,13 @@ if "%1" == "data" set build_data=1
 if "%1" == "hant" set build_hant=1
 if "%1" == "rime" set build_rime=1
 if "%1" == "librime" set build_rime=1
+if "%1" == "installer" set build_installer=1
 if "%1" == "all" (
   set build_boost=1
   set build_data=1
   set build_hant=1
   set build_rime=1
+  set build_installer=1
 )
 if "%1" == "nox64" set build_x64=0
 shift
@@ -108,6 +111,12 @@ if %build_x64% == 1 (
 )
 msbuild.exe weasel.sln %build_option% /p:Configuration=Release /p:Platform="Win32" /fl1
 if errorlevel 1 goto error
+
+if %build_installer% == 1 (
+  "%ProgramFiles(x86)%"\NSIS\Bin\makensis.exe output\install.nsi
+  if errorlevel 1 goto error
+)
+
 goto end
 
 :build_boost