diff --git a/global-config b/global-config
index 1ad8393..87f534b 100644
--- a/global-config
+++ b/global-config
@@ -3,6 +3,7 @@
 # Copyright (c) 2013-2020 Christian Hesse <mail@eworm.de>
 #
 # global configuration
+# https://git.eworm.de/cgit/routeros-scripts/about/
 
 # Make sure all configuration properties are up to date and this
 # value is in sync with value in script 'global-functions'!
diff --git a/global-config-overlay b/global-config-overlay
index 90740cd..afe0dc4 100644
--- a/global-config-overlay
+++ b/global-config-overlay
@@ -3,6 +3,7 @@
 # Copyright (c) 2013-2020 Christian Hesse <mail@eworm.de>
 #
 # global configuration, custom overlay
+# https://git.eworm.de/cgit/routeros-scripts/about/
 
 # Make sure all configuration properties are up to date and this
 # value is in sync with value in script 'global-functions'!
diff --git a/global-functions b/global-functions
index 1aa64d2..e98491c 100644
--- a/global-functions
+++ b/global-functions
@@ -4,6 +4,7 @@
 #                         Michael Gisbers <michael@gisbers.de>
 #
 # global functions
+# https://git.eworm.de/cgit/routeros-scripts/about/
 
 # expected configuration version
 :global ExpectedConfigVersion 14;