diff --git a/documentation/demo/callback.md b/documentation/demo/callback.md
index f871e453..7f6d2a5e 100644
--- a/documentation/demo/callback.md
+++ b/documentation/demo/callback.md
@@ -21,7 +21,7 @@ $(function(){
     $.contextMenu({
         selector: '.context-menu-one', 
         callback: function(itemKey, opt, rootMenu, originalEvent) {
-            var m = "global: " + key;
+            var m = "global: " + itemKey;
             window.console && console.log(m) || alert(m); 
         },
         items: {