diff -up dhcp-4.1.0/client/dhclient.c.usage dhcp-4.1.0/client/dhclient.c

--- dhcp-4.1.0/client/dhclient.c.usage	2009-01-06 10:36:55.000000000 -1000

+++ dhcp-4.1.0/client/dhclient.c	2009-01-06 10:39:58.000000000 -1000

@@ -990,6 +990,10 @@ static void usage()

 		  "[-s server]");

 	log_error("                [-cf config-file] [-lf lease-file]%s",

 		  "[-pf pid-file] [-e VAR=val]");

+	log_error("                [-I <dhcp-client-identifier>] [-B]");

+	log_error("                [-H <host-name> | -F <fqdn.fqdn>] [-timeout <timeout>]");

+	log_error("                [-V <vendor-class-identifier>]");

+	log_error("                [-R <request option list>]");

 	log_fatal("                [-sf script-file] [interface]");

 }