apps/nshlib/nsh_command.c:  Update help text.
@@ -103,7 +103,7 @@ static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
static const struct cmdmap_s g_cmdmap[] =
{
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_TEST)
- { "[", cmd_lbracket, 4, CONFIG_NSH_MAXARGUMENTS, "<expression> ]" },
+ { "[", cmd_lbracket, 4, CONFIG_NSH_MAXARGUMENTS, "[!] <expression> ]" },
#endif
#ifndef CONFIG_NSH_DISABLE_HELP
