diff --git a/level.go b/level.go
index 6381bf1..283cd9b 100644
--- a/level.go
+++ b/level.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package logutils augments the standard log package with levels.
 package logutils
 
diff --git a/level_benchmark_test.go b/level_benchmark_test.go
index 3c2caf7..521edc6 100644
--- a/level_benchmark_test.go
+++ b/level_benchmark_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package logutils
 
 import (
diff --git a/level_test.go b/level_test.go
index f6b6ac3..6494d6f 100644
--- a/level_test.go
+++ b/level_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package logutils
 
 import (