diff --git a/src/cmd/go/aiopt.go b/src/cmd/go/aiopt.go
index 3e15869516eb41345985c6a183587e81946ae4c3..6d72196eedd2a29894014374a90a329bbf996278 100644
--- a/src/cmd/go/aiopt.go
+++ b/src/cmd/go/aiopt.go
@@ -1,3 +1,7 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package main
 
 import (
diff --git a/src/cmd/go/operators.go b/src/cmd/go/operators.go
index 2fc3792ee9efebed0a21680bb3e7053d76fabbd2..571e5a7f003b22329146a83128138b0c16ade0e8 100644
--- a/src/cmd/go/operators.go
+++ b/src/cmd/go/operators.go
@@ -1,3 +1,7 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package main
 
 import (
diff --git a/src/cmd/go/utils.go b/src/cmd/go/utils.go
index 5c2fa3a97eda3f4854dd5618422af1c16b5e8645..b96a8f01271b411337654da1d66f751f2792e053 100644
--- a/src/cmd/go/utils.go
+++ b/src/cmd/go/utils.go
@@ -1,3 +1,7 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package main
 
 import (