--- a/plugins/check_dns-serial	Tue Dec 30 00:46:41 2014 +0100
+++ b/plugins/check_dns-serial	Tue Dec 30 09:42:07 2014 +0100
@@ -1,4 +1,22 @@
 #! /usr/bin/perl
+# © 2014 Heiko Schlittermann <hs@schlittermann.de>
+=head1 NAME
+
+ check_dns-serial - check the dns serial number from multiple sources
+
+=head1 SYNOPSIS
+
+ check_dns-serial [options] DOMAINS
+
+=head1 DESCRIPTION
+
+B<check_dns-serial> is designed as a Icinga/Nagios plugin to verify that
+all responsible NS have the same serial number for their zones.
+
+Domains we are not responsible for are marked as B<critical>.
+
+=cut
+
 use 5.014;
 use strict;
 use warnings;
@@ -77,7 +95,7 @@
 
 sub main {
     my @argv          = @_;
-    my $opt_reference = '212.80.235.130';
+    my $opt_reference = '127.0.0.1';
     my $opt_progress  = -t;
 
     GetOptionsFromArray(
@@ -127,21 +145,13 @@
 
 __END__
 
-=head1 NAME
-
- check_dns-serial - check the dns serial number from multiple sources
-
-=head1 SYNOPSIS
-
- check_dns-serial [options] DOMAINS
-
 =head1 OPTIONS
 
 =over
 
 =item B<--reference>=I<address>
 
-The address of the reference server for our own domains (default: 212.80.235.130)
+The address of the reference server for our own domains (default: 127.0.0.1)
 
 =item B<--progress>