diff --git a/expirable/expirable_lru.go b/expirable/expirable_lru.go
index b1612b9..005f1a0 100644
--- a/expirable/expirable_lru.go
+++ b/expirable/expirable_lru.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package expirable
 
 import (
diff --git a/expirable/expirable_lru_test.go b/expirable/expirable_lru_test.go
index 5ad2fef..cc328e3 100644
--- a/expirable/expirable_lru_test.go
+++ b/expirable/expirable_lru_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package expirable
 
 import (