diff --git a/bin/dns-sync b/bin/dns-sync
index 4482de2..4af5e06 100755
--- a/bin/dns-sync
+++ b/bin/dns-sync
@@ -1,5 +1,8 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+# This file is part of dnmgmt, a number resource management system
+# Licensed under GNU General Public License v3 or later
+# Written by Sebastian Lohff (seba@someserver.de)
 import argparse
 import configparser
 import os
diff --git a/bin/import-data b/bin/import-data
index 2eeedce..f2ab8ea 100755
--- a/bin/import-data
+++ b/bin/import-data
@@ -1,5 +1,8 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+# This file is part of dnmgmt, a number resource management system
+# Licensed under GNU General Public License v3 or later
+# Written by Sebastian Lohff (seba@someserver.de)
 
 import argparse
 import json
diff --git a/bin/markdown-to-html b/bin/markdown-to-html
index 8566293..add89d5 100755
--- a/bin/markdown-to-html
+++ b/bin/markdown-to-html
@@ -1,5 +1,8 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+# This file is part of dnmgmt, a number resource management system
+# Licensed under GNU General Public License v3 or later
+# Written by Sebastian Lohff (seba@someserver.de)
 
 import markdown
 from markdown.extensions.toc import TocExtension
diff --git a/bin/whoisd b/bin/whoisd
index cf7143b..bea559d 100755
--- a/bin/whoisd
+++ b/bin/whoisd
@@ -1,5 +1,8 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+# This file is part of dnmgmt, a number resource management system
+# Licensed under GNU General Public License v3 or later
+# Written by Sebastian Lohff (seba@someserver.de)
 
 import argparse
 import socketserver