diff --git a/README.md b/README.md
index 48c4b3b20..005b88900 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ end
 
 class UsersController < ApplicationController
   def user_params
-    params.require(:user).permit(:name, :tag_list) ## Rails 4 strong params usage
+    params.require(:user).permit(:name, :tag_list => []) ## Rails 4 strong params usage
   end
 end