diff --git a/networking/filtering-proxy/main.tf b/networking/filtering-proxy/main.tf
index 5e45d2fa..b36daeec 100644
--- a/networking/filtering-proxy/main.tf
+++ b/networking/filtering-proxy/main.tf
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2021 Google LLC
+ *
+ * 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.
+ */
+
 locals {
   squid_address = (
     var.mig
diff --git a/networking/filtering-proxy/outputs.tf b/networking/filtering-proxy/outputs.tf
index f6d97006..adfb7912 100644
--- a/networking/filtering-proxy/outputs.tf
+++ b/networking/filtering-proxy/outputs.tf
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2021 Google LLC
+ *
+ * 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.
+ */
+
 output "squid-address" {
   value = local.squid_address
 }
diff --git a/networking/filtering-proxy/variables.tf b/networking/filtering-proxy/variables.tf
index 3541bd63..9b66bd35 100644
--- a/networking/filtering-proxy/variables.tf
+++ b/networking/filtering-proxy/variables.tf
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2021 Google LLC
+ *
+ * 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.
+ */
+
 variable "billing_account" {
   description = "Billing account id used as default for new projects."
   type        = string