diff --git a/Cakefile b/Cakefile
index 8f0799c..cc58f0c 100644
--- a/Cakefile
+++ b/Cakefile
@@ -34,16 +34,32 @@ source_files = ->
       all_sources.push source
   all_sources.unique()
 
+# Get the version number
+#
+version = ->
+  "#{fs.readFileSync('VERSION')}".replace /[^0-9a-zA-Z.]*/gm, ''
+
+# Write chosen files with a header
+#
+write_chosen_javascript = (filename, body) ->
+  fs.writeFileSync filename, """
+// Chosen #{version()} https://github.com/harvesthq/chosen
+// Copyright (c) 2011 Harvest http://getharvest.com
+// MIT License, https://github.com/harvesthq/chosen/blob/master/LICENSE.md
+// This file is generated by `cake build`, do not edit it by hand.
+#{body}
+"""
+
 # Build Chosen.
 #
 task 'build', 'build Chosen from source', build = (cb) ->
   for javascript, sources of javascripts
     code = ''
     for source in sources
-      code += CoffeeScript.compile "\n#{fs.readFileSync source}"
-    fs.writeFileSync javascript, code
+      code += CoffeeScript.compile "#{fs.readFileSync source}"
+    write_chosen_javascript javascript, code
     unless process.env.MINIFY is 'false'
-      fs.writeFileSync javascript.replace(/\.js$/,'.min.js'), (
+      write_chosen_javascript javascript.replace(/\.js$/,'.min.js'), (
         uglify.gen_code uglify.ast_squeeze uglify.ast_mangle parser.parse code
       )
     cb() if typeof cb is 'function'
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..b63ba69
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+0.9