diff --git a/edges.go b/edges.go
index 2e452f3..be731ac 100644
--- a/edges.go
+++ b/edges.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import "sort"
diff --git a/iradix.go b/iradix.go
index 8774020..8dbb261 100644
--- a/iradix.go
+++ b/iradix.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (
diff --git a/iradix_test.go b/iradix_test.go
index 42bfa39..2fd0b78 100644
--- a/iradix_test.go
+++ b/iradix_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (
diff --git a/iter.go b/iter.go
index ffd2721..1f10add 100644
--- a/iter.go
+++ b/iter.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (
diff --git a/node.go b/node.go
index 1be9639..42db090 100644
--- a/node.go
+++ b/node.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (
diff --git a/node_test.go b/node_test.go
index d11eb51..1bc8888 100644
--- a/node_test.go
+++ b/node_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (
diff --git a/path_iter.go b/path_iter.go
index 21942af..6d6d696 100644
--- a/path_iter.go
+++ b/path_iter.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import "bytes"
diff --git a/path_iter_test.go b/path_iter_test.go
index 9f76ca4..01da2bc 100644
--- a/path_iter_test.go
+++ b/path_iter_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (
diff --git a/raw_iter.go b/raw_iter.go
index dd84f08..8430111 100644
--- a/raw_iter.go
+++ b/raw_iter.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 // rawIterator visits each of the nodes in the tree, even the ones that are not
diff --git a/reverse_iter.go b/reverse_iter.go
index 2a06cde..1799cab 100644
--- a/reverse_iter.go
+++ b/reverse_iter.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (
diff --git a/reverse_iter_test.go b/reverse_iter_test.go
index a68886c..180016c 100644
--- a/reverse_iter_test.go
+++ b/reverse_iter_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package iradix
 
 import (