diff --git a/src/collision/Resolver.js b/src/collision/Resolver.js
index 53a6b819..b3b16ab8 100644
--- a/src/collision/Resolver.js
+++ b/src/collision/Resolver.js
@@ -172,6 +172,7 @@ var Resolver = {};
      * Description
      * @method solveVelocity
      * @param {pair[]} pairs
+     * @param {timescale} timeScale
      */
     Resolver.solveVelocity = function(pairs, timeScale) {
         var impulse = {},
@@ -269,4 +270,4 @@ var Resolver = {};
         }
     };
 
-})();
\ No newline at end of file
+})();