diff --git a/decoder/validate.go b/decoder/validate.go
index 001d8da1..f84e0a08 100644
--- a/decoder/validate.go
+++ b/decoder/validate.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package decoder
 
 import (
diff --git a/decoder/validate_test.go b/decoder/validate_test.go
index 47e4708a..2864267a 100644
--- a/decoder/validate_test.go
+++ b/decoder/validate_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package decoder
 
 import (
diff --git a/lang/validate.go b/lang/validate.go
index 68234b09..df04e746 100644
--- a/lang/validate.go
+++ b/lang/validate.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package lang
 
 import (