diff --git a/drivers/parport/procfs.c b/drivers/parport/procfs.c
index 8ee44a104..4880404 100644
--- a/drivers/parport/procfs.c
+++ b/drivers/parport/procfs.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Sysctl interface for parport devices.
  * 
  * Authors: David Campbell