docs: def comment(self, comment):
          """ Add a :class:`Comment <pypump.models.comment.Comment>`
          to the object.
  
          :param comment: A :class:`Comment <pypump.models.comment.Comment>`
              instance, text content is also accepted.
  
          Example:
              >>> anote.comment(pump.Comment('I agree!'))
  
              """
          if isinstance(comment, six.string_types):
              comment = self._pump.Comment(comment)
  
          comment.in_reply_to = self
          comment.send()