Fix entity_decode() issue
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index d41e799..a0ed34a 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -7,6 +7,10 @@
 
 Release Date: Not Released
 
+-  **Security**
+
+   -  Fixed a flaw in :doc:`Security Library <libraries/security>` method ``entity_decode()`` (used by ``xss_clean()``) that affects HTML 5 entities when using PHP 5.3.
+
 -  General Changes
 
    -  Added ``E_PARSE`` to the list of error levels detected by the shutdown handler.