diff --git a/INSTALL b/INSTALL
index 232307e..48408bf 100644
--- a/INSTALL
+++ b/INSTALL
@@ -3,3 +3,23 @@
  $ cd ots/test/
  $ sudo apt-get install scons g++ libfreetype6-dev
  $ scons
+
+How to build (on Windows) (experimental):
+
+  1. Download zlib compiled DLL from http://www.zlib.net/ and install them
+     following the instruction described in the document.
+
+  2. Install gyp (Generate Your Projects) from http://code.google.com/p/gyp/.
+     You will need a subversion client to install gyp.
+     See http://code.google.com/p/gyp/source/checkout to install gyp.
+
+  3. Generate MSVS project file.
+
+    $ gyp --depth=. -f msvs ots-standalone.gyp
+
+  4. Open the generated project file (ots-standalone.sln) and build it.
+     Make sure that zlib.h and zconf.h are located in a directory found in
+     the INCLUDE path list.
+
+  5. Test binary (only idempotent.exe for now) will be located in Default/
+     directory.