diff --git a/dist/js/npm.js b/dist/js/npm.js
index c7c20adfe1..d5e4f476d5 100644
--- a/dist/js/npm.js
+++ b/dist/js/npm.js
@@ -1,3 +1,4 @@
+// This file is generated. You can require() it in a CommonJS environment.
 require('../../js/transition.js')
 require('../../js/alert.js')
 require('../../js/button.js')
diff --git a/grunt/bs-commonjs-generator.js b/grunt/bs-commonjs-generator.js
index e5173944ca..1b0da182f7 100644
--- a/grunt/bs-commonjs-generator.js
+++ b/grunt/bs-commonjs-generator.js
@@ -10,7 +10,8 @@ module.exports = function generateCommonJSModule(grunt, srcFiles, destFilepath)
     return 'require(\'' + requirePath + '\')';
   }
 
-  var moduleOutputJs = srcFiles.map(srcPathToDestRequire).join('\n');
+  var moduleOutputJs = '// This file is generated. You can require() it in a CommonJS environment.\n' +
+  srcFiles.map(srcPathToDestRequire).join('\n');
   try {
     fs.writeFileSync(destFilepath, moduleOutputJs);
   }