diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 55403616..74a419b3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,8 +1,8 @@
 ## How to Open a Backbone.js Ticket
 
 * Do not use tickets to ask for help with (debugging) your application. Ask on
-the [mailing list](https://groups.google.com/forum/#!forum/backbonejs), 
-in the IRC channel (`#documentcloud` on Freenode), or if you understand your 
+the [mailing list](https://groups.google.com/forum/#!forum/backbonejs),
+in the IRC channel (`#documentcloud` on Freenode), or if you understand your
 specific problem, on [StackOverflow](http://stackoverflow.com/questions/tagged/backbone.js).
 
 * Before you open a ticket or send a pull request,
@@ -11,12 +11,13 @@ discussions about the same feature or issue. Add to the earlier ticket if you
 find one.
 
 * Before sending a pull request for a feature or bug fix, be sure to have
-[tests](http://backbonejs.org/test/).
+[tests](http://backbonejs.org/test/) and to document any new functionality in
+the `index.html`.
 
 * Use the same coding style as the rest of the
 [codebase](https://github.com/jashkenas/backbone/blob/master/backbone.js).
 
-* In your pull request, do not add documentation or rebuild the minified
-`backbone-min.js` file. We'll do that before cutting a new release.
+* In your pull request, do not regenerate the annotated sources or rebuild the
+minified `backbone-min.js` file. We'll do that before cutting a new release.
 
 * All pull requests should be made to the `master` branch.