diff --git a/lam/docs/manual-sources/howto.xml b/lam/docs/manual-sources/howto.xml
index db965236..b15a2546 100644
--- a/lam/docs/manual-sources/howto.xml
+++ b/lam/docs/manual-sources/howto.xml
@@ -691,6 +691,15 @@ Have fun!
       <section id="a_versUpgrade">
         <title>Version specific upgrade instructions</title>
 
+        <section>
+          <title>4.1 -&gt; 4.2</title>
+
+          <para>Zarafa users: The default attribute for mail aliases is now
+          "dn". If you use "uid" and did not change the server profile for a
+          long time please check your LAM server profile for this setting and
+          save it.</para>
+        </section>
+
         <section>
           <title>4.0 -&gt; 4.1</title>