[ci skip] Fix #3919, #4732
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index c09c1b5..400b36e 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -12,7 +12,7 @@
 Bug fixes for 3.1.1
 -------------------
 
-
+-  Fixed a bug (#4732) - :doc:`Session Library <libraries/sessions>` triggered errors while writing data for a newly-created sessions with the 'memcached' driver.
 
 
 Version 3.1.0