diff --git a/src/ng/interval.js b/src/ng/interval.js
index 452c8ee81417..42b69b8933b3 100644
--- a/src/ng/interval.js
+++ b/src/ng/interval.js
@@ -33,7 +33,8 @@ function $IntervalProvider() {
       * appropriate moment.  See the example below for more details on how and when to do this.
       * </div>
       *
-      * @param {function()} fn A function that should be called repeatedly.
+      * @param {function()} fn A function that should be called repeatedly. If no additional arguments
+      *   are passed (see below), the function is called with the current iteration count.
       * @param {number} delay Number of milliseconds between each function call.
       * @param {number=} [count=0] Number of times to repeat. If not set, or 0, will repeat
       *   indefinitely.