Well.  I do not know if comments for pmacros is deprecated, but if not,
here's a small patch that documents the argument.

2001-11-16  Johan Rydberg  <johan@rydberg.com>

          * doc/pmacros.texi (Defining a preprocessor macro): Document
          "comment" argument for (define-pmacro ...).

-- 
Johan Rydberg

$ ON F$ERROR("LANGUAGE","ENGLISH","IN_MESSAGE").GT.F$ERROR("NORMAL") -
              THEN EXCUSE/OBJECT=ME