diff --git a/gointerfaces/type_utils.go b/gointerfaces/type_utils.go
index dac95908b..22a44b4c9 100644
--- a/gointerfaces/type_utils.go
+++ b/gointerfaces/type_utils.go
@@ -1,3 +1,16 @@
+/*
+   Copyright 2021 Erigon contributors
+   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 gointerfaces
 
 import (