Tweak readme

README.md

@@ -10,7 +10,9 @@ A react component for playing media from YouTube, SoundCloud, Streamable or Vime
 
 The component parses a URL and loads in the appropriate markup and external SDKs to play media from [various sources](#supported-media). [Props](#props) can be passed in to control playback and react to events such as buffering or media ending.
 
-If you are using `npm` and need to support [browsers without `Promise`](http://caniuse.com/#feat=promises) you will need a [`Promise` polyfill](https://github.com/stefanpenner/es6-promise). If you are playing `Streamable` videos you will also need a [`fetch` polyfill](https://github.com/github/fetch) for [browsers without `fetch`](http://caniuse.com/#feat=fetch)
+### Polyfills
+
+If you are using `npm` and need to support [browsers without `Promise`](http://caniuse.com/#feat=promises) you will need a [`Promise` polyfill](https://github.com/stefanpenner/es6-promise). To support `Streamable` videos you will also need a [`fetch` polyfill](https://github.com/github/fetch) for [browsers without `fetch`](http://caniuse.com/#feat=fetch)
 
 ### Usage