code: def addcomment(self, order_increment_id,
              status, comment=None, notify=False):
          
          if comment is None:
              comment = ""
          return bool(self.call(
                  'sales_order.addComment',
                  [order_increment_id, status, comment, notify]
              )
          )
docs: Add comment to order or change its state
  
          :param order_increment_id: Order ID
          TODO: Identify possible values for status