diff --git a/nixos/doc/manual/release-notes/rl-1709.xml b/nixos/doc/manual/release-notes/rl-1709.xml
index 1d6e693f83c..f91db4a154e 100644
--- a/nixos/doc/manual/release-notes/rl-1709.xml
+++ b/nixos/doc/manual/release-notes/rl-1709.xml
@@ -335,6 +335,13 @@ FLUSH PRIVILEGES;
     was removed and should not be needed anymore.</para>
   </listitem>
 
+  <listitem>
+    <para>
+      Redis has been updated to version 4 which mandates a cluster
+      mass-restart, due to changes in the network handling, in order
+      to ensure compatibility with networks NATing traffic.
+    </para>
+  </listitem>
 </itemizedlist>
 
 <para>Other notable improvements:</para>