diff --git a/src/saml2/attribute_resolver.py b/src/saml2/attribute_resolver.py
index a183a2b..6a3d050 100644
--- a/src/saml2/attribute_resolver.py
+++ b/src/saml2/attribute_resolver.py
@@ -1,3 +1,24 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2009 Umeå University
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#            http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Contains classes and functions that a SAML2.0 Service Provider (SP) may use
+to do attribute aggregation.
+"""
 import os
 import urllib
 import saml2