[ci skip] Protect CSRF verification from timing side-channel attacks
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index ad7d6a4..7284d10 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -10,6 +10,7 @@
 -  **Security**
 
    -  Fixed an XSS vulnerability in :doc:`Security Library <libraries/security>` method ``xss_clean()``.
+   -  Added protection against timing side-channel attacks in :doc:`Security Library <libraries/security>` method ``csrf_verify()``.
 
 -  General Changes