diff --git a/sbin/comcontrol/comcontrol.8 b/sbin/comcontrol/comcontrol.8
--- a/sbin/comcontrol/comcontrol.8
+++ b/sbin/comcontrol/comcontrol.8
@@ -1,13 +1,17 @@
-.Dd May 15, 1994
+.Dd August 31, 2025
 .Dt COMCONTROL 8
 .Os
 .Sh NAME
 .Nm comcontrol
 .Nd control a special tty device
+.Sh DEPRECATION NOTICE
+The
+.Nm
+utility is deprecated and will be removed in
+.Fx 16.0 .
 .Sh SYNOPSIS
 .Nm
 .Ar special_device
-.Op dtrwait Ar number
 .Op drainwait Ar number
 .Sh DESCRIPTION
 The
@@ -22,13 +26,6 @@
 .Pp
 The following options are available:
 .Bl -tag -width indent
-.It Cm dtrwait Ar number
-Set the time to wait after dropping DTR
-to the given number.
-The units are hundredths of a second.
-The default is 300 hundredths, i.e., 3 seconds.
-This option needed mainly to set proper recover time after
-modem reset.
 .It Cm drainwait Ar number
 Set the time to wait for output drain
 to the given number.
@@ -57,7 +54,6 @@
 Originally part of cgd's com package patches, version 0.2.1, to
 .Bx 386 0.1 .
 Once controlled bidirectional capabilities.
-Little is left to control now
-that these capabilities are standard.
+Little is left to control now that these capabilities are standard.
 .Sh AUTHORS
 .An Christopher G. Demetriou
diff --git a/sbin/comcontrol/comcontrol.c b/sbin/comcontrol/comcontrol.c
--- a/sbin/comcontrol/comcontrol.c
+++ b/sbin/comcontrol/comcontrol.c
@@ -46,7 +46,7 @@
 usage(void)
 {
 	fprintf(stderr,
-	"usage: comcontrol <filename> [dtrwait <n>] [drainwait <n>]\n");
+	"usage: comcontrol <filename> [drainwait <n>]\n");
 	exit(1);
 }
 
@@ -55,8 +55,8 @@
 {
 	int	fd;
 	int     res = 0;
-	int     print_dtrwait = 1, print_drainwait = 1;
-	int     dtrwait = -1, drainwait = -1;
+	int     print_drainwait = 1;
+	int     drainwait = -1;
 
 	if (argc < 2)
 		usage();
@@ -71,13 +71,6 @@
 		}
 	}
 	if (argc == 2) {
-		if (ioctl(fd, TIOCMGDTRWAIT, &dtrwait) < 0) {
-			print_dtrwait = 0;
-			if (errno != ENOTTY) {
-				res = 1;
-				warn("TIOCMGDTRWAIT");
-			}
-		}
 		if (ioctl(fd, TIOCGDRAINWAIT, &drainwait) < 0) {
 			print_drainwait = 0;
 			if (errno != ENOTTY) {
@@ -85,21 +78,12 @@
 				warn("TIOCGDRAINWAIT");
 			}
 		}
-		if (print_dtrwait)
-			printf("dtrwait %d ", dtrwait);
 		if (print_drainwait)
 			printf("drainwait %d ", drainwait);
 		printf("\n");
 	} else {
 		while (argv[2] != NULL) {
-			if (!strcmp(argv[2],"dtrwait")) {
-				if (dtrwait >= 0)
-					usage();
-				if (argv[3] == NULL || !isdigit(argv[3][0]))
-					usage();
-				dtrwait = atoi(argv[3]);
-				argv += 2;
-			} else if (!strcmp(argv[2],"drainwait")) {
+			if (!strcmp(argv[2],"drainwait")) {
 				if (drainwait >= 0)
 					usage();
 				if (argv[3] == NULL || !isdigit(argv[3][0]))
@@ -109,12 +93,6 @@
 			} else
 				usage();
 		}
-		if (dtrwait >= 0) {
-			if (ioctl(fd, TIOCMSDTRWAIT, &dtrwait) < 0) {
-				res = 1;
-				warn("TIOCMSDTRWAIT");
-			}
-		}
 		if (drainwait >= 0) {
 			if (ioctl(fd, TIOCSDRAINWAIT, &drainwait) < 0) {
 				res = 1;
diff --git a/sys/sys/ttycom.h b/sys/sys/ttycom.h
--- a/sys/sys/ttycom.h
+++ b/sys/sys/ttycom.h
@@ -69,8 +69,8 @@
 						/* 89-91 conflicts: tun and tap */
 #define	TIOCTIMESTAMP	_IOR('t', 89, struct timeval)	/* enable/get timestamp
 						 * of last input event */
-#define	TIOCMGDTRWAIT	_IOR('t', 90, int)	/* modem: get wait on close */
-#define	TIOCMSDTRWAIT	_IOW('t', 91, int)	/* modem: set wait on close */
+/*	TIOCMGDTRWAIT	_IOR('t', 90, int)	 * was modem: get wait on close */
+/*	TIOCMSDTRWAIT	_IOW('t', 91, int)	 * was modem: set wait on close */
 						/* 92-93 tun and tap */
 						/* 94-97 conflicts: tun and tap */
 #define	TIOCDRAIN	 _IO('t', 94)		/* wait till output drained */