diff --git a/phpfpm/exporter.go b/phpfpm/exporter.go
index 2814c15..ae8dbc1 100644
--- a/phpfpm/exporter.go
+++ b/phpfpm/exporter.go
@@ -1,3 +1,16 @@
+// Copyright © 2018 Enrico Stahn <enrico.stahn@gmail.com>
+// 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.
+
 package phpfpm
 
 import (