strUsage+=HelpMessageOpt("-txexpirynotify=<cmd>",_("Execute command when transaction expires (%s in cmd is replaced by transaction id)"));
strUsage+=HelpMessageOpt("-prune=<n>",strprintf(_("Reduce storage requirements by pruning (deleting) old blocks. This mode disables wallet support and is incompatible with -txindex. "
"Warning: Reverting this setting requires re-downloading the entire blockchain. "
"(default: 0 = disable pruning blocks, >%u = target size in MiB to use for block files)"),MIN_DISK_SPACE_FOR_BLOCK_FILES/1024/1024));