Add a missing changelog entry for pull #1227
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 52cd516..3ea95d9 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -176,6 +176,7 @@
- Fixed a bug (#940) - csrf_verify() used to set the CSRF cookie while processing a POST request with no actual POST data, which resulted in validating a request that should be considered invalid.
- Fixed a bug in PostgreSQL's escape_str() where it didn't properly escape LIKE wild characters.
- Fixed a bug in the library loader where some PHP versions wouldn't execute the class constructor.
+- Fixed a bug (#88) - An unexisting property was used for configuration of the Memcache cache driver.
Version 2.1.1
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