usage(void)
{
printf("%s: secure channel, a relay for OpenFlow messages.\n"
- "usage: %s [OPTIONS] nl:DP_IDX [CONTROLLER]\n"
- "where nl:DP_IDX is a datapath that has been added with dpctl.\n"
+ "usage: %s [OPTIONS] DATAPATH [CONTROLLER]\n"
+ "DATAPATH is an active connection method to a local datapath.\n"
"CONTROLLER is an active OpenFlow connection method; if it is\n"
"omitted, then secchan performs controller discovery.\n",
program_name, program_name);