diff --git a/ace/ace.d.ts b/ace/ace.d.ts
index 4758b59e96..f0668da3c4 100644
--- a/ace/ace.d.ts
+++ b/ace/ace.d.ts
@@ -2609,6 +2609,16 @@ declare module AceAjax {
          * Returns `true` if there are redo operations left to perform.
         **/
         hasRedo(): boolean;
+        
+        /**
+         * Returns `true` if the dirty counter is 0
+        **/
+        isClean(): boolean;
+        
+        /**
+         * Sets dirty counter to 0
+        **/
+        markClean(): void;
 
     }
     var UndoManager: {