() Hong Xu <hong@topbug.net>
() Tue, 18 Oct 2016 13:16:58 -0700

    (defun show-paren--default ()
   +  "The default value of `show-paren-data-function'."

It's better to describe what the function does, first.  Where
and how it is used is secondary.  (It's no problem to refer to
‘show-paren-data-function’, if it follows the description.)

-- 
Thien-Thi Nguyen -----------------------------------------------
 (defun responsep (type via)
   (case type
     (technical (eq 'mailing-list via))
     ...))                              748E A0E8 1CB8 A748 9BFA
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