diff --git a/lib/ace/undomanager.js b/lib/ace/undomanager.js
index 33c76526..15b22e06 100644
--- a/lib/ace/undomanager.js
+++ b/lib/ace/undomanager.js
@@ -44,11 +44,6 @@ var UndoManager = function() {
 
 (function() {
 
-    /*this.$doc = null;
-    this.setDocument = function(doc) {
-        this.$doc = doc;
-    };*/
-
     this.execute = function(options) {
         var deltas = options.args[0];
         this.$doc  = options.args[1];