diff --git a/gruntjs/gruntjs.d.ts b/gruntjs/gruntjs.d.ts
index ff672d368..baea9dcfb 100644
--- a/gruntjs/gruntjs.d.ts
+++ b/gruntjs/gruntjs.d.ts
@@ -793,9 +793,19 @@ declare module grunt {
             
             /**
              * Check with the name, if a task exists in the registered tasks.
+             * @param name The task name to check.
              * @since 0.4.5
              */
             exists(name: string): boolean;
+            
+            /**
+             * Rename a task. This might be useful if you want to override the default behavior of a task, while retaining the old name.
+             * Note that if a task has been renamed, the this.name and this.nameArgs properties will change accordingly.
+             * @see ITask
+             * @param oldname The previous name of the task.
+             * @param newname The new name for the task.
+             */
+            renameTask(oldname: string, newname: string): void
         }
 
         /**