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(libc.info)Argp Help Filter Keys

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Special Keys for Argp Help Filter Functions
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   The following special values may be passed to an argp help filter
function as the first argument in addition to key values for user
options.  They specify which help text the TEXT argument contains:

`ARGP_KEY_HELP_PRE_DOC'
     The help text preceding options.

`ARGP_KEY_HELP_POST_DOC'
     The help text following options.

`ARGP_KEY_HELP_HEADER'
     The option header string.

`ARGP_KEY_HELP_EXTRA'
     This is used after all other documentation; TEXT is zero for this
     key.

`ARGP_KEY_HELP_DUP_ARGS_NOTE'
     The explanatory note printed when duplicate option arguments have
     been suppressed.

`ARGP_KEY_HELP_ARGS_DOC'
     The argument doc string; formally the `args_doc' field from the
     argp parser.  Note: Argp Parsers.