diff --git a/nixos/doc/manual/release-notes/rl-1603.xml b/nixos/doc/manual/release-notes/rl-1603.xml
index 0ede1a9ce8ed..83057a44d0ae 100644
--- a/nixos/doc/manual/release-notes/rl-1603.xml
+++ b/nixos/doc/manual/release-notes/rl-1603.xml
@@ -247,6 +247,21 @@ $TTL 1800
     </programlisting>
   </listitem>
 
+  <listitem>
+    <para>
+    <literal>service.syncthing.dataDir</literal> options now has to point
+    to exact folder where syncthing is writing to. Example configuration should
+    loook something like:
+    </para>
+    <programlisting>
+services.syncthing = {
+    enable = true;
+    dataDir = "/home/somebody/.syncthing";
+    user = "somebody";
+};
+    </programlisting>
+  </listitem>
+
 </itemizedlist>