diff --git a/nixos/doc/manual/release-notes/rl-1909.xml b/nixos/doc/manual/release-notes/rl-1909.xml
index d4d87716be3..e0f71aadaba 100644
--- a/nixos/doc/manual/release-notes/rl-1909.xml
+++ b/nixos/doc/manual/release-notes/rl-1909.xml
@@ -254,6 +254,15 @@
        If IBus support in Qt 4.x applications is required, add the <literal>ibus-qt</literal> package to your <xref linkend="opt-environment.systemPackages" /> manually.
      </para>
    </listitem>
+   <listitem>
+     <para>
+       The CUPS Printing service now uses socket-based activation by
+       default, only starting when needed. The previous behavior can
+       be restored by setting
+       <option>services.cups.startWhenNeeded</option> to
+       <literal>false</literal>.
+     </para>
+   </listitem>
   </itemizedlist>
  </section>