Updated with 2.1-stable.
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 2ada9ee..89a6a95 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -147,6 +147,8 @@
- Libraries
- Further improved MIME type detection in the :doc:`File Uploading Library <libraries/file_uploading>`.
+- Helpers
+ - url_title() performance and output improved. You can now use any string as the word delimiter, but 'dash' and 'underscore' are still supported.
Bug fixes for 2.1.1
-------------------