(defun info-lookup-add-help (&rest arg)
"Add or update a help specification.
-Function arguments are one or more options of the form
+Function arguments are specified as keyword/argument pairs:
- KEYWORD ARGUMENT
+ \(KEYWORD . ARGUMENT)
KEYWORD is either `:topic', `:mode', `:regexp', `:ignore-case',
`:doc-spec', `:parse-rule', or `:other-modes'.