diff --git a/pkg/rulefmt/rulefmt.go b/pkg/rulefmt/rulefmt.go
index 97e7bd8e9..cd922fd4f 100644
--- a/pkg/rulefmt/rulefmt.go
+++ b/pkg/rulefmt/rulefmt.go
@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// 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 rulefmt
 
 import (
diff --git a/pkg/rulefmt/rulefmt_test.go b/pkg/rulefmt/rulefmt_test.go
index 693956599..fd914e839 100644
--- a/pkg/rulefmt/rulefmt_test.go
+++ b/pkg/rulefmt/rulefmt_test.go
@@ -1,3 +1,16 @@
+// Copyright 2017 The Prometheus Authors
+// 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 rulefmt
 
 import (