code: func (a *API) UpdateRuleSetGroup(cfg *RuleSetGroup) (*RuleSetGroup, error) {
  	if cfg == nil {
  		return nil, fmt.Errorf("Invalid rule set group config [nil]")
  	}
  
  	groupCID := string(cfg.CID)
  
  	matched, err := regexp.MatchString(config.RuleSetGroupCIDRegex, groupCID)
  	if err != nil {
  		return nil, err
  	}
  	if !matched {
  		return nil, fmt.Errorf("Invalid rule set group CID [%s]", groupCID)
  	}
  
  	jsonCfg, err := json.Marshal(cfg)
  	if err != nil {
  		return nil, err
  	}
  
  	if a.Debug {
  		a.Log.Printf("[DEBUG] update rule set group, sending JSON: %s", string(jsonCfg))
  	}
  
  	result, err := a.Put(groupCID, jsonCfg)
  	if err != nil {
  		return nil, err
  	}
  
  	groups := &RuleSetGroup{}
  	if err := json.Unmarshal(result, groups); err != nil {
  		return nil, err
  	}
  
  	return groups, nil
  }
docs: // UpdateRuleSetGroup updates passed rule set group.