diff --git a/perl-xCAT/xCAT/Usage.pm b/perl-xCAT/xCAT/Usage.pm
index bb207ebc3..36e0f4f75 100644
--- a/perl-xCAT/xCAT/Usage.pm
+++ b/perl-xCAT/xCAT/Usage.pm
@@ -17,7 +17,7 @@ use xCAT::Utils;
 
 my %usage = (
     "rnetboot" => 
-"Usage: rnetboot <noderange> [-s net|hd] [-F] [-f] [--hfi] [-I|--iscsiboot] [-V|--verbose] [-m table.colum==expectedstatus] [-m table.colum==expectedstatus...] [-r <retrycount>] [-t <timeout>]
+"Usage: rnetboot <noderange> [-s net|hd] [-F] [-f] [--hfi] [-V|--verbose] [-m table.colum==expectedstatus] [-m table.colum==expectedstatus...] [-r <retrycount>] [-t <timeout>]
        rnetboot [-h|--help|-v|--version]",
     "rpower" => 
 "Usage: rpower <noderange> [--nodeps] [on|onstandby|off|suspend|reset|stat|state|boot] [-V|--verbose] [-m table.colum==expectedstatus][-m table.colum==expectedstatus...] [-r <retrycount>] [-t <timeout>]