Update README.md (#469)

README.md

@@ -49,7 +49,7 @@ module.exports = {
 }
 ```
 
-It moves all the `require("style.css")`s in entry chunks into a separate single CSS file. So your styles are no longer inlined into the JS bundle, but separate in a CSS bundle file (`styles.css`). If your total stylesheet volume is big, it will be faster because the CSS bundle is loaded in parallel to the JS bundle.
+It moves all the required `*.css` modules in entry chunks into a separate CSS file. So your styles are no longer inlined into the JS bundle, but in a separate CSS file (`styles.css`). If your total stylesheet volume is big, it will be faster because the CSS bundle is loaded in parallel to the JS bundle.
 
 |Advantages|Caveats|
 |:---------|:------|