diff --git a/plugins/zfs/zfs_usage_ b/plugins/zfs/zfs_usage_
index 5117e18e..4aeb17e9 100755
--- a/plugins/zfs/zfs_usage_
+++ b/plugins/zfs/zfs_usage_
@@ -22,6 +22,10 @@ Create one symlink per zpool for exampe zfs_usage_system
  #%# family=auto
  #%# capabilities=autoconf suggest
 
+=head1 LICENSE
+
+GPLv2
+
 =cut
 
 use strict;