diff --git a/stm32/mk4-bootloader/secrets.h b/stm32/mk4-bootloader/secrets.h
index 8498498d..95bddb43 100644
--- a/stm32/mk4-bootloader/secrets.h
+++ b/stm32/mk4-bootloader/secrets.h
@@ -1,3 +1,6 @@
+/*
+ * (c) Copyright 2018 by Coinkite Inc. This file is covered by license found in COPYING-CC.
+ */
 #pragma once
 #include <stdint.h>