diff --git a/Gruntfile.js b/Gruntfile.js
index 88d935e6..e6d5e053 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -82,14 +82,19 @@ module.exports = function(grunt) {
         },
         options: {
           standalone: 'JSZip',
-          ignore:['./lib/nodeBuffer.js','./lib/nodeBufferReader']
+          ignore:['./lib/nodeBuffer.js','./lib/nodeBufferReader'],
+          postBundleCB: function(err, src, done) {
+            var license = require('fs').readFileSync('lib/license_header.js');
+            done(err, license + src);
+          }
         }
       }
     },
     uglify: {
       options: {
         report: 'gzip',
-        mangle: true
+        mangle: true,
+        preserveComments: 'some'
       },
       all: {
         src: 'dist/jszip.js',
diff --git a/lib/index.js b/lib/index.js
index 092736a4..e7f6b631 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,12 +1,5 @@
 'use strict';
 /**
-
-JSZip - A Javascript class for generating and reading zip files
-<http://stuartk.com/jszip>
-
-(c) 2009-2012 Stuart Knightley <stuart [at] stuartk.com>
-Dual licenced under the MIT license or GPLv3. See https://raw.github.com/Stuk/jszip/master/LICENSE.markdown.
-
 Usage:
    zip = new JSZip();
    zip.file("hello.txt", "Hello, World!").file("tempfile", "nothing");
diff --git a/lib/license_header.js b/lib/license_header.js
new file mode 100644
index 00000000..741827a6
--- /dev/null
+++ b/lib/license_header.js
@@ -0,0 +1,8 @@
+/*!
+
+JSZip - A Javascript class for generating and reading zip files
+<http://stuartk.com/jszip>
+
+(c) 2009-2012 Stuart Knightley <stuart [at] stuartk.com>
+Dual licenced under the MIT license or GPLv3. See https://raw.github.com/Stuk/jszip/master/LICENSE.markdown.
+*/