Update README.md

drjova · Mar 5, 2014 · fee06b5 · fee06b5
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 You are now good to go ;)
 
+### Browser Compatibility
+IE9+ 
+BttrLazyLoading relies on array.indexOf which was not introduced until IE9. There is a poly fill for this function available here however, it does not help with IE8 support completely.
+
 ### Contributors
 
 * [Julien Renaux](https://github.com/shprink)