diff --git a/arch/m68k/mac/macboing.c b/arch/m68k/mac/macboing.c
index ffaa1f6..fa2b960 100644
--- a/arch/m68k/mac/macboing.c
+++ b/arch/m68k/mac/macboing.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *	Mac bong noise generator. Note - we ought to put a boingy noise
  *	here 8)