diff --git a/sys/netinet/tcp.h b/sys/netinet/tcp.h
--- a/sys/netinet/tcp.h
+++ b/sys/netinet/tcp.h
@@ -336,6 +336,7 @@
 #define	TCPI_OPT_ECN		0x08
 #define	TCPI_OPT_TOE		0x10
 #define	TCPI_OPT_TFO		0x20
+#define	TCPI_OPT_ACE		0x40
 
 /* Maximum length of log ID. */
 #define TCP_LOG_ID_LEN	64
diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
--- a/sys/netinet/tcp_usrreq.c
+++ b/sys/netinet/tcp_usrreq.c
@@ -1556,8 +1556,20 @@
 		ti->tcpi_snd_wscale = tp->snd_scale;
 		ti->tcpi_rcv_wscale = tp->rcv_scale;
 	}
-	if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
-		ti->tcpi_options |= TCPI_OPT_ECN;
+	switch (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) {
+		case TF2_ECN_PERMIT:
+			ti->tcpi_options |= TCPI_OPT_ECN;
+			break;
+		case TF2_ACE_PERMIT:
+			/* FALLTHROUGH */
+		case TF2_ECN_PERMIT | TF2_ACE_PERMIT:
+			ti->tcpi_options |= TCPI_OPT_ACE;
+			break;
+		default:
+			break;
+	}
+	if (IS_FASTOPEN(tp->t_flags))
+		ti->tcpi_options |= TCPI_OPT_TFO;
 
 	ti->tcpi_rto = tp->t_rxtcur * tick;
 	ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;