How to use css modules with create-react-app

Question

In response to a tweet from Dan Abramov, create-react-app supports CSS modules (CRA). To enable the feature, all one needs to do is add the module.css extension to his stylesheets, however, this doesn't work for me. React-Scripts version 1.1.4 is what I'm using. How do I use CRA to activate CSS modules? Thanks