diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index f5b26ef178200..9a1567dbc022b 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1,4 +1,4 @@
-
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Packet matching code for ARP packets.
  *