code: def add_filter(self, filter_id, description):
          
          filter_line = '##FILTER=<ID={0},Description="{1}">'.format(
              filter_id, description
          )
          logger.info("Adding filter line to vcf: {0}".format(filter_line))
          self.parse_meta_data(filter_line)
          return
docs: Add a filter line to the header.
  
          Arguments:
              filter_id (str): The id of the filter line
              description (str): A description of the info line