diff --git a/nixos/doc/manual/release-notes/rl-2009.xml b/nixos/doc/manual/release-notes/rl-2009.xml
index 7da1f502378..ed4e71234b9 100644
--- a/nixos/doc/manual/release-notes/rl-2009.xml
+++ b/nixos/doc/manual/release-notes/rl-2009.xml
@@ -556,6 +556,12 @@ services.bitcoind."example-mainnet" = {
 </programlisting>
     </para>
    </listitem>
+   <listitem>
+    <para>
+      Graylog introduced a change in the LDAP server certificate validation behaviour for version 3.3.3 which might break existing setups.
+      When updating Graylog from a version before 3.3.3 make sure to check the Graylog <link xlink:href="https://www.graylog.org/post/announcing-graylog-v3-3-3">release info</link> for information on how to avoid the issue.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>