diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index df8b3c12a173416a89030192edaabe196584d989..4e4617e90417b3174ffcbe1ec69b92bb3dff4a33 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5029,7 +5029,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
 	/* step 3: check security and precedence [ignored] */
 
 	/* step 4: Check for a SYN
-	 * RFC 5691 4.2 : Send a challenge ack
+	 * RFC 5961 4.2 : Send a challenge ack
 	 */
 	if (th->syn) {
 syn_challenge: