Fixed #428 -- added a changelog
diff --git a/docs/contributing.rst b/docs/contributing.rst
index 657c435..8e32c36 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -29,6 +29,8 @@
   backwards incompatible release of a dependency) no pull requests may be
   merged until this is rectified.
 * All merged patches must have 100% test coverage.
+* New features and significant bug fixes should be documented in the
+  :doc:`/changelog`.
 
 The purpose of these policies is to minimize the chances we merge a change
 which jeopardizes our users' security.