facebook/react — pull request #892 by rtfeldman (2014-01-15 01:00:47+00:00)
Title: Mention need for `es5-sham.js` in docs

You need both `es5-shim.js` *and* `es5-sham.js` in order for React to work in IE8.

Having this in the docs would certainly have saved me some time!