link to code ownership page from CONTRIBUTING.rst file

CONTRIBUTING.rst

@@ -101,7 +101,10 @@ If your pull request meets the requirements listed in the
 then it will be scheduled for code review by one or more core committers. This
 process sometimes takes awhile: currently, all core committers on the project
 are employees of edX, and they have to balance their time between code review
-and new development.
+and new development. Please also read our `code ownership page`_, which
+lists areas and concepts in the codebase that are "owned" by certain developers.
+If your change touches one of these areas or concepts, that developer should be
+one of the reviewers.
 
 Once the code review process has started, please be responsive to comments on
 the pull request, so we can keep the review process moving forward.
@@ -109,6 +112,8 @@ If you are unable to respond for a few days, that's fine, but
 please add a comment informing us of that -- otherwise, it looks like you're
 abandoning your work!
 
+.. _code ownership page: https://github.com/edx/edx-platform/wiki/Code-Ownership
+
 Step 6: Merge!
 ==============