fixed documentation on resize event

README.md

@@ -41,6 +41,7 @@ reveal.js comes with a broad range of features including [nested slides](https:/
   - [Fullscreen mode](#fullscreen-mode)
   - [Embedded media](#embedded-media)
   - [Stretching elements](#stretching-elements)
+  - [Resize Event](#resize-event)
   - [postMessage API](#postmessage-api)
 - [PDF Export](#pdf-export)
 - [Theming](#theming)
@@ -963,7 +964,7 @@ Limitations:
 When reveal.js changes the scale of the slides it fires an resize event. You can subscribe to the event to resize your elements accordingly.
 
 ```javascript
-Reveal.addEventListener( 'overviewshown', function( event ) { /* console.log(event.scale,event.oldscale,event.size); */ } );
+Reveal.addEventListener( 'resize', function( event ) { /* console.log(event.scale,event.oldscale,event.size); */ } );
 ```
 
 ### postMessage API