diff --git a/src/System/Logger/Message.hs b/src/System/Logger/Message.hs
index d6fd588f51dc7249ba4b3c6dd7edbd8c4de4c10e..7de1bfb729adca1d1232e2b0a769427c5fd9c307 100644
--- a/src/System/Logger/Message.hs
+++ b/src/System/Logger/Message.hs
@@ -1,3 +1,7 @@
+-- This Source Code Form is subject to the terms of the Mozilla Public
+-- License, v. 2.0. If a copy of the MPL was not distributed with this
+-- file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 {-# LANGUAGE OverloadedStrings #-}
 
 module System.Logger.Message