diff --git a/internal/errors/error_test.go b/internal/errors/error_test.go
index ec41ab5..67d3a8d 100644
--- a/internal/errors/error_test.go
+++ b/internal/errors/error_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package errors
 
 import (
diff --git a/internal/errors/testing.go b/internal/errors/testing.go
index f3f6522..d53d494 100644
--- a/internal/errors/testing.go
+++ b/internal/errors/testing.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package errors
 
 import (
diff --git a/plugin/service/storage/error.go b/plugin/service/storage/error.go
index e7c6245..950921b 100644
--- a/plugin/service/storage/error.go
+++ b/plugin/service/storage/error.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package storage
 
 import (
diff --git a/plugin/service/storage/error_test.go b/plugin/service/storage/error_test.go
index 8ee5712..dca3197 100644
--- a/plugin/service/storage/error_test.go
+++ b/plugin/service/storage/error_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package storage
 
 import (