The man page is VERY WRONG about using "-o noupdate" with -s.

So fix it, and add an example using -s.

usr.sbin/boot0cfg/boot0cfg.8

@@ -78,8 +78,6 @@ Install the
 boot manager.
 This option causes MBR code to be replaced, without
 affecting the embedded slice table.
-.It Fl v
-Verbose: display information about the slices defined, etc.
 .It Fl b Ar boot0
 Specify which
 .Sq boot0
@@ -135,12 +133,14 @@ Set the default boot selection to
 Values between 1 and 4 refer to slices; a value of 5 refers to the
 option of booting from a second disk.
 This would normally be used in conjunction with the
-.Sq noupdate
+.Sq update
 option.
 .It Fl t Ar ticks
 Set the timeout value to
 .Ar ticks .
 (There are approximately 18.2 ticks per second.)
+.It Fl v
+Verbose: display information about the slices defined, etc.
 .El
 .Sh FILES
 .Bl -tag -width /boot/boot0 -compact
@@ -149,11 +149,18 @@ The default
 .Sq boot0
 image
 .El
+.Sh EXAMPLES
+The following is an example of a typical usage
+of the
+.Nm
+command to affect the next boot:
+.Pp
+.Dl "boot0cfg -o update -s 2 ad0"
+.Sh DIAGNOSTICS
+.Ex -std
 .Sh SEE ALSO
 .Xr boot 8 ,
 .Xr fdisk 8
-.Sh DIAGNOSTICS
-.Ex -std
 .Sh AUTHORS
 .An Robert Nordier Aq rnordier@FreeBSD.org .
 .Sh BUGS