diff --git a/src/pam.rs b/src/pam.rs
index d2e9aab38f07d00d2dcc15aa1793a8ca365495fe..fdd58b32a4d5965824ae175a6056cf7600dd8eed 100644
--- a/src/pam.rs
+++ b/src/pam.rs
@@ -1,3 +1,18 @@
+/* Copyright 2021 Dominik George <nik@naturalnet.de>
+ *
+ * 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.
+ */
+
 use crate::config::{
     argv_to_config,
     get_config