diff --git a/sbin/dkctl/dkctl.8 b/sbin/dkctl/dkctl.8
index 60274326249c..cd0761eb7093 100644
--- a/sbin/dkctl/dkctl.8
+++ b/sbin/dkctl/dkctl.8
@@ -1,4 +1,4 @@
-.\"	$NetBSD: dkctl.8,v 1.2 2002/01/09 23:10:19 wiz Exp $
+.\"	$NetBSD: dkctl.8,v 1.3 2002/07/01 18:49:57 yamt Exp $
 .\"
 .\" Copyright 2002 Wasabi Systems, Inc.
 .\" All rights reserved.
@@ -88,6 +88,17 @@ write cache blocks to the media.  If
 is specified, the cache synchronization command will be issued even
 if the kernel does not believe that there are any dirty cache blocks
 in the disk's cache.
+.Pp
+.Nm keeplabel
+.Op Ar yes | no
+.Pp
+Specify to keep or drop the in-core disklabel on the last close of
+the disk device.
+(Keep if
+.Ar yes
+is specified, drop if
+.Ar no
+is specified.)
 .Sh SEE ALSO
 .Xr ioctl 2 ,
 .Xr sd 4 ,
diff --git a/sbin/dkctl/dkctl.c b/sbin/dkctl/dkctl.c
index 2350217f5319..f0d94b74087e 100644
--- a/sbin/dkctl/dkctl.c
+++ b/sbin/dkctl/dkctl.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: dkctl.c,v 1.1 2002/01/09 22:30:14 thorpej Exp $	*/
+/*	$NetBSD: dkctl.c,v 1.2 2002/07/01 18:49:57 yamt Exp $	*/
 
 /*
  * Copyright 2001 Wasabi Systems, Inc.
@@ -51,6 +51,14 @@
 #include <unistd.h>
 #include <util.h>
 
+#define	YES	1
+#define	NO	0
+
+/* I don't think nl_langinfo is suitable in this case */
+#define	YES_STR	"yes"
+#define	NO_STR	"no"
+#define YESNO_ARG	YES_STR " | " NO_STR
+
 struct command {
 	const char *cmd_name;
 	const char *arg_names;
@@ -67,9 +75,12 @@ char	dvname_store[MAXPATHLEN];	/* for opendisk(3) */
 const	char *cmdname;			/* command user issued */
 const	char *argnames;			/* helpstring; expected arguments */
 
+int yesno(const char *);
+
 void	disk_getcache(int, char *[]);
 void	disk_setcache(int, char *[]);
 void	disk_synccache(int, char *[]);
+void	disk_keeplabel(int, char *[]);
 
 struct command commands[] = {
 	{ "getcache",
@@ -87,6 +98,11 @@ struct command commands[] = {
 	  disk_synccache,
 	  O_RDWR },
 
+	{ "keeplabel",
+	  YESNO_ARG,
+	  disk_keeplabel,
+	  O_RDWR },
+
 	{ NULL,
 	  NULL,
 	  NULL,
@@ -225,3 +241,36 @@ disk_synccache(int argc, char *argv[])
 	if (ioctl(fd, DIOCCACHESYNC, &force) == -1)
 		err(1, "%s: sync cache", dvname);
 }
+
+void
+disk_keeplabel(int argc, char *argv[])
+{
+	int keep;
+	int yn;
+
+	if (argc != 1)
+		usage();
+
+	yn = yesno(argv[0]);
+	if (yn < 0)
+		usage();
+
+	keep = yn == YES;
+
+	if (ioctl(fd, DIOCKLABEL, &keep) == -1)
+		err(1, "%s: keep label", dvname);
+}
+
+/*
+ * return YES, NO or -1.
+ */
+int
+yesno(const char *p)
+{
+
+	if (!strcmp(p, YES_STR))
+		return YES;
+	if (!strcmp(p, NO_STR))
+		return NO;
+	return -1;
+}