diff --git a/src/kiwmi/main.h b/src/kiwmi/main.h
index 7336143..e6311bc 100644
--- a/src/kiwmi/main.h
+++ b/src/kiwmi/main.h
@@ -1,3 +1,10 @@
+/* Copyright (c), Niclas Meyer <niclas@countingsort.com>
+ *
+ * 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/.
+ */
+
 #ifndef MAIN_H
 #define MAIN_H