Use "MXID" as placeholder for -m option, instead of just "XID".
printf(_(" -e XIDEPOCH set next transaction ID epoch\n"));
printf(_(" -f force update to be done\n"));
printf(_(" -l XLOGFILE force minimum WAL starting location for new transaction log\n"));
- printf(_(" -m XID,XID set next and oldest multitransaction ID\n"));
+ printf(_(" -m MXID,MXID set next and oldest multitransaction ID\n"));
printf(_(" -n no update, just show extracted control values (for testing)\n"));
printf(_(" -o OID set next OID\n"));
printf(_(" -O OFFSET set next multitransaction offset\n"));