diff --git a/nixos/doc/manual/release-notes/rl-1609.xml b/nixos/doc/manual/release-notes/rl-1609.xml
index d864f0654985..d1af87ea8824 100644
--- a/nixos/doc/manual/release-notes/rl-1609.xml
+++ b/nixos/doc/manual/release-notes/rl-1609.xml
@@ -81,6 +81,14 @@ following incompatible changes:</para>
     behavior of Redis 3.2</para>
   </listitem>
 
+  <listitem>
+    <para>
+      <literal>/var/empty</literal> is now immutable. Activation script runs <command>chattr +i</command>
+      to forbid any modifications inside the folder. See <link xlink:href="https://github.com/NixOS/nixpkgs/pull/18365">
+      the pull request</link> for what bugs this caused.
+    </para>
+  </listitem>
+
   <listitem>
     <para>Gitlab's maintainance script
     <command>gitlab-runner</command> was removed and split up into the