Variable: comment-fill-column
comment-fill-column is a customizable variable defined in
newcomment.el.gz.
Value
nil
Documentation
Column to use for comment-indent. If nil, use fill-column instead.
Source Code
;; Defined in /usr/src/emacs/lisp/newcomment.el.gz
(defcustom comment-fill-column nil
"Column to use for `comment-indent'. If nil, use `fill-column' instead."
:type '(choice (const nil) integer)
:group 'comment)