Variable: f90-indented-comment-re
f90-indented-comment-re is a customizable variable defined in
f90.el.gz.
Value
"!"
Documentation
Regexp matching comments to indent as code.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/f90.el.gz
(defcustom f90-indented-comment-re "!"
"Regexp matching comments to indent as code."
:type 'regexp
:safe 'stringp
:group 'f90-indent)