* `flags`::
* mask of parse_opt_option_flags.
* PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
- * PARSE_OPT_NOARG: says that this option takes no argument
+ * PARSE_OPT_NOARG: says that this option does not take an argument
* PARSE_OPT_NONEG: says that this option cannot be negated
* PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
* shown only in the full usage.