Fix #4927
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index cb95d17..0d8a93b 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -23,6 +23,7 @@
- Fixed a bug (#4916) - :doc:`Session Library <libraries/sessions>` with ``sess_match_ip`` enabled was unusable for IPv6 clients when using the 'database' driver on MySQL 5.7.5+.
- Fixed a bug (#4917) - :doc:`Date Helper <helpers/date_helper>` function :php:func:`nice_date()` didn't handle YYYYMMDD inputs properly.
- Fixed a bug (#4923) - :doc:`Session Library <libraries/sessions>` could execute an erroneous SQL query with the 'database' driver, if the lock attempt times out.
+- Fixed a bug (#4927) - :doc:`Output Library <libraries/output>` method ``get_header()`` returned the first matching header, regardless of whether it would be replaced by a second ``set_header()`` call.
Version 3.1.2
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