info-lookup-add-help
info-lookup-add-help is a compiled Lisp function in `info-look.el
'.
(info-lookup-add-help &rest ARG)
Add or update a help specification.
Function arguments are specified as keyword/argument pairs:
(KEYWORD . ARGUMENT)
KEYWORD is either `:topic', `:mode', `:regexp', `:ignore-case',
`:doc-spec', `:parse-rule', or `:other-modes'.
ARGUMENT has a value as explained in the documentation of the
variable `info-lookup-alist'.
If no topic or mode option has been specified, then the help topic defaults
to `symbol', and the help mode defaults to the current major mode.