diff --git a/sbin/newfs/newfs.8 b/sbin/newfs/newfs.8
index 64548bbb6d9d..ef90f88a9a28 100644
--- a/sbin/newfs/newfs.8
+++ b/sbin/newfs/newfs.8
@@ -80,6 +80,12 @@
 .Op Fl o Ar options
 .Op Fl s Ar size
 .Ar special node
+.Sh WARNING
+.Nm mount_mfs
+is being phased out.
+Please see
+.Xr mdconfig 8
+for the replacement.
 .Sh DESCRIPTION
 .Nm Newfs
 is used to initialize and clear filesystems before first use.
diff --git a/sbin/newfs/newfs.c b/sbin/newfs/newfs.c
index cc86950a2500..8a9f00dac778 100644
--- a/sbin/newfs/newfs.c
+++ b/sbin/newfs/newfs.c
@@ -245,6 +245,12 @@ main(argc, argv)
 	if (strstr(progname, "mfs")) {
 		mfs = 1;
 		Nflag++;
+		fprintf(stderr,
+"WARNING: MFS is being phased out in preference for md devices\n"
+"WARNING: Please see mdconfig(8) for details\n"
+"WARNING: Continuing in 15 seconds\n");
+		sleep(15);
+
 	}
 
 	opstring = mfs ?