diff --git a/plugins/mod_sipwise_groups.lua b/plugins/mod_sipwise_groups.lua
index 1421d50..059b744 100644
--- a/plugins/mod_sipwise_groups.lua
+++ b/plugins/mod_sipwise_groups.lua
@@ -1,5 +1,9 @@
 -- Load PBX groups from DDBB
 -- Copyright (C) 2013 Sipwise GmbH <development@sipwise.com>
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
 
 local lookup_query = [[
 SELECT g.name, s.username, d.domain
diff --git a/plugins/mod_sipwise_vhosts_sql.lua b/plugins/mod_sipwise_vhosts_sql.lua
index 6ab1e2a..e2b460d 100644
--- a/plugins/mod_sipwise_vhosts_sql.lua
+++ b/plugins/mod_sipwise_vhosts_sql.lua
@@ -1,6 +1,9 @@
 -- Load vhosts from DB on startup of Prosody XMPP server.
 -- Copyright (C) 2013 Sipwise GmbH <development@sipwise.com>
 --
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
 
 module:set_global();
 
diff --git a/plugins/mod_sipwise_vjud.lua b/plugins/mod_sipwise_vjud.lua
index a8405db..75196bf 100644
--- a/plugins/mod_sipwise_vjud.lua
+++ b/plugins/mod_sipwise_vjud.lua
@@ -1,3 +1,9 @@
+--
+-- Copyright (C) 2013 Sipwise GmbH <development@sipwise.com>
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
 local nodeprep = require "util.encodings".stringprep.nodeprep;
 local jid_split = require "util.jid".split;
 local sql = module:require("sql");