diff --git a/perl-xCAT-2.0/xCAT/Usage.pm b/perl-xCAT-2.0/xCAT/Usage.pm
index 02005217b..f676e722c 100644
--- a/perl-xCAT-2.0/xCAT/Usage.pm
+++ b/perl-xCAT-2.0/xCAT/Usage.pm
@@ -16,7 +16,7 @@ use Getopt::Long;
 
 my %usage = (
     "rnetboot" => 
-"Usage: rnetboot <noderange> [-V|--verbose]
+"Usage: rnetboot <noderange> [-f][-V|--verbose]
        rnetboot [-h|--help|-v|--version]",
     "rpower" => 
 "Usage: rpower <noderange> [--nodeps][on|off|reset|stat|state|boot|of|cycle] [-V|--verbose]