diff --git a/internal/lsp/cache/check.go b/internal/lsp/cache/check.go
index 7a40c68..fca2804 100644
--- a/internal/lsp/cache/check.go
+++ b/internal/lsp/cache/check.go
@@ -1,3 +1,7 @@
+// Copyright 2019 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 cache
 
 import (
diff --git a/internal/lsp/cache/parse.go b/internal/lsp/cache/parse.go
index d42b7aa..29cd001 100644
--- a/internal/lsp/cache/parse.go
+++ b/internal/lsp/cache/parse.go
@@ -1,3 +1,7 @@
+// Copyright 2019 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 cache
 
 import (
diff --git a/internal/lsp/cache/pkg.go b/internal/lsp/cache/pkg.go
index 64a11fb..440b655 100644
--- a/internal/lsp/cache/pkg.go
+++ b/internal/lsp/cache/pkg.go
@@ -1,3 +1,7 @@
+// Copyright 2019 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 cache
 
 import (
diff --git a/internal/lsp/source/util.go b/internal/lsp/source/util.go
index d53d7c1..66002cc 100644
--- a/internal/lsp/source/util.go
+++ b/internal/lsp/source/util.go
@@ -1,3 +1,7 @@
+// Copyright 2019 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 source
 
 import (