Update user_guide_src/source/changelog.rst
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index da3be3a..13482d8 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -132,6 +132,7 @@
- Allowed for setting table class defaults in a config file.
- Added a Wincache driver to the :doc:`Caching Library <libraries/caching>`.
- Added dsn (delivery status notification) option to the :doc:`Email Library <libraries/email>`.
+ - Enabled public access to Email library's set_header() for adding additional headers to e-mails.
- Core