diff --git a/CHANGES.rst b/CHANGES.rst
index 21d71107..329f9899 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -23,11 +23,13 @@ Bugfixes & Improvements
 - Improve Spanish translation (`#967`_, welpo)
 - Make language code handling more robust (`#983`_, ix5)
 - Prevent auto creation of invalid links in comments (`#995`_, pkvach)
+- Fix W3C Validation issues (`#999`_, pkvach)
 
 .. _#951: https://github.com/posativ/isso/pull/951
 .. _#967: https://github.com/posativ/isso/pull/967
 .. _#983: https://github.com/posativ/isso/pull/983
 .. _#995: https://github.com/isso-comments/isso/pull/995
+.. _#999: https://github.com/isso-comments/isso/pull/999
 
 0.13.1.dev0 (2023-02-05)
 ------------------------