diff --git a/nixos/doc/manual/release-notes/rl-1909.xml b/nixos/doc/manual/release-notes/rl-1909.xml
index 049d21d01b2..6f049005ab6 100644
--- a/nixos/doc/manual/release-notes/rl-1909.xml
+++ b/nixos/doc/manual/release-notes/rl-1909.xml
@@ -219,6 +219,13 @@
        Nodejs 8 is scheduled EOL under the lifetime of 19.09 and has been dropped.
      </para>
    </listitem>
+   <listitem>
+     <para>
+       By default, prometheus exporters are now run with <literal>DynamicUser</literal> enabled.
+       Exporters that need a real user, now run under a seperate user and group which follow the pattern <literal>&lt;exporter-name&gt;-exporter</literal>, instead of the previous default <literal>nobody</literal> and <literal>nogroup</literal>.
+       Only some exporters are affected by the latter, namely the exporters <literal>dovecot</literal>, <literal>node</literal>, <literal>postfix</literal> and <literal>varnish</literal>.
+     </para>
+   </listitem>
   </itemizedlist>
  </section>