diff --git a/constraint.go b/constraint.go
index da5d1ac..9f7f9d3 100644
--- a/constraint.go
+++ b/constraint.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package version
 
 import (
diff --git a/constraint_test.go b/constraint_test.go
index 5338c8e..e76d3b0 100644
--- a/constraint_test.go
+++ b/constraint_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package version
 
 import (
diff --git a/version.go b/version.go
index e87df69..5d7aba6 100644
--- a/version.go
+++ b/version.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package version
 
 import (
diff --git a/version_collection.go b/version_collection.go
index cc888d4..83547fe 100644
--- a/version_collection.go
+++ b/version_collection.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package version
 
 // Collection is a type that implements the sort.Interface interface
diff --git a/version_collection_test.go b/version_collection_test.go
index 14783d7..b6298a8 100644
--- a/version_collection_test.go
+++ b/version_collection_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package version
 
 import (
diff --git a/version_test.go b/version_test.go
index 08cbf01..8256794 100644
--- a/version_test.go
+++ b/version_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package version
 
 import (