def _add_rank_score(self, variant_obj, info_dict):
        """Add the rank score if found
        
        Args:
            variant_obj (puzzle.models.Variant)
            info_dict (dict): A info dictionary
        
        """
        rank_score_entry = info_dict.get('RankScore')
        if rank_score_entry:
            for family_annotation in rank_score_entry.split(','):
                rank_score = family_annotation.split(':')[-1]
            logger.debug("Updating rank_score to: {0}".format(
                rank_score))
            variant_obj.rank_score = float(rank_score)