diff --git a/xCAT-server/lib/xcat/plugins/ddns.pm b/xCAT-server/lib/xcat/plugins/ddns.pm
index 6f8ef970e..31b5b6e0f 100755
--- a/xCAT-server/lib/xcat/plugins/ddns.pm
+++ b/xCAT-server/lib/xcat/plugins/ddns.pm
@@ -1370,6 +1370,7 @@ sub update_namedconf {
     flock($newnameconf, LOCK_EX);
     seek($newnameconf, 0, 0);
     truncate($newnameconf, 0);
+    print $newnameconf "\#This file is generated by xCAT.\n";
     for my $l (@newnamed) { print $newnameconf $l; }
     flock($newnameconf, LOCK_UN);
     close($newnameconf);