[ci skip] Fix #5131
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index c8348b0..aed8413 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -17,6 +17,7 @@
 -  Fixed a bug (#5070) - :doc:`Email Library <libraries/email>` didn't properly detect 7-bit encoding.
 -  Fixed a bug (#5084) - :doc:`XML-RPC Library <libraries/xmlrpc>` errored because of a variable name typo.
 -  Fixed a bug (#5108) - :doc:`Inflector Helper <helpers/inflector_helper>` function :php:func:`singular()` didn't properly handle 'quizzes'.
+-  Fixed a regression (#5131) - private controller methods triggered PHP errors instead of a 404 response.
 
 Version 3.1.4
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