diff --git a/net/l3mdev/l3mdev.c b/net/l3mdev/l3mdev.c
index 864326f150e2fc..ad7730b68772cf 100644
--- a/net/l3mdev/l3mdev.c
+++ b/net/l3mdev/l3mdev.c
@@ -241,6 +241,7 @@ EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
  *				L3 master device
  *	@net: network namespace for device index lookup
  *	@fl:  flow struct
+ *	@arg: store the table the rule matched with here
  */
 
 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,