[ci skip] Fix #4613
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index d50c0a0..567eb10 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -27,6 +27,7 @@
- Fixed a bug (#4562) - :doc:`Cache Library <libraries/caching>` didn't check if ``Memcached::quit()`` is available before calling it.
- Fixed a bug (#4563) - :doc:`Input Library <libraries/input>` method ``request_headers()`` ignores ``$xss_clean`` parameter value after first call.
- Fixed a bug (#4605) - :doc:`Config Library <libraries/config>` method ``site_url()`` stripped trailing slashes from relative URIs passed to it.
+- Fixed a bug (#4613) - :doc:`Email Library <libraries/config>` failed to send multiple emails via SMTP due to "already authenticated" errors when keep-alive is enabled.
Version 3.0.6
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