diff --git a/src/body/World.js b/src/body/World.js
index 0b890d6..12d1d07 100644
--- a/src/body/World.js
+++ b/src/body/World.js
@@ -9,6 +9,7 @@
 * and [DemoMobile.js](https://github.com/liabru/matter-js/blob/master/demo/js/DemoMobile.js) for usage examples.
 *
 * @class World
+* @extends Composite
 */
 
 var World = {};
diff --git a/src/core/Common.js b/src/core/Common.js
index 5087f09..c6a4db9 100644
--- a/src/core/Common.js
+++ b/src/core/Common.js
@@ -256,8 +256,6 @@ var Common = {};
         if (!console || !console.log || !console.warn)
             return;
 
-        var style;
-
         switch (type) {
 
         case 'warn':