strUsage+=HelpMessageOpt("-limitdescendantsize=<n>",strprintf("Do not accept transactions if any ancestor would have more than <n> kilobytes of in-mempool descendants (default: %u).",DEFAULT_DESCENDANT_SIZE_LIMIT));
strUsage+=HelpMessageOpt("-bip9params=deployment:start:end","Use given start/end times for specified BIP9 deployment (regtest-only)");