Fix #4015
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index e409cc6..4e8f2f7 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -75,6 +75,7 @@
- Fixed a bug (#4004) - :doc:`URI Class <libraries/uri>` didn't properly parse the request URI if it contains a colon followed by a digit.
- Fixed a bug in :doc:`Query Builder <database/query_builder>` where the ``$escape`` parameter for some methods only affected field names.
- Fixed a bug (#4012) - :doc:`Query Builder <database/query_builder>` methods ``where_in()``, ``or_where_in()``, ``where_not_in()``, ``or_where_not_in()`` didn't take into account previously cached WHERE conditions when query cache is in use.
+- Fixed a bug (#4015) - :doc:`Email Library <libraries/email>` method ``set_header()`` didn't support method chaining, although it was advertised.
Version 3.0.0
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