diff --git a/plugins/mail/policyd-spf-python b/plugins/mail/policyd-spf-python
index 15d12a08..f51a7b8b 100755
--- a/plugins/mail/policyd-spf-python
+++ b/plugins/mail/policyd-spf-python
@@ -2,6 +2,8 @@
 #
 #   Munin plugin to monitor postfix-policyd-spf-python results
 #   Contributed by Alexander Koch <lynix47@gmail.com> 
+#
+#   This plugin is published under the terms of the MIT License.
 # 
 # Parameters understood:
 #	config		(required)