diff --git a/src/lib.rs b/src/lib.rs
index 99395e3..4370fe1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,11 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * (c) ZeroTier, Inc.
+ * https://www.zerotier.com/
+ */
+
 mod os_socket;
 
 use std::collections::HashSet;
diff --git a/src/os_socket.rs b/src/os_socket.rs
index 5f9bde0..c238127 100644
--- a/src/os_socket.rs
+++ b/src/os_socket.rs
@@ -1,3 +1,11 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * (c) ZeroTier, Inc.
+ * https://www.zerotier.com/
+ */
+
 #[allow(unused_imports)]
 use num_traits::AsPrimitive;