diff --git a/internal/ingress/annotations/xforwardedprefix/main.go b/internal/ingress/annotations/xforwardedprefix/main.go
index e5735b5f91..e25beebe39 100644
--- a/internal/ingress/annotations/xforwardedprefix/main.go
+++ b/internal/ingress/annotations/xforwardedprefix/main.go
@@ -1,3 +1,19 @@
+/*
+Copyright 2017 The Kubernetes 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 xforwardedprefix
 
 import (
diff --git a/internal/ingress/annotations/xforwardedprefix/main_test.go b/internal/ingress/annotations/xforwardedprefix/main_test.go
index 41be4c826e..95a4d1f7cb 100644
--- a/internal/ingress/annotations/xforwardedprefix/main_test.go
+++ b/internal/ingress/annotations/xforwardedprefix/main_test.go
@@ -1,3 +1,19 @@
+/*
+Copyright 2017 The Kubernetes 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 xforwardedprefix
 
 import (