diff --git a/README.md b/README.md
index 025d807..c2eec93 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ Add a listener for when the browser switches in and out of fullscreen.
 | callback  | <code>function</code> | function to be called when the browser switches in and out of fullscreen|
 
 Usage:
-```
+```js
 fullscreenChange(function() {
   console.log('switch fullscreen');
 });