code: func (operation *Operation) ParseEmptyResponseComment(commentLine string) error {
  	var matches []string
  
  	if matches = emptyResponsePattern.FindStringSubmatch(commentLine); len(matches) != 3 {
  		return fmt.Errorf("can not parse response comment \"%s\"", commentLine)
  	}
  
  	response := spec.Response{}
  
  	code, _ := strconv.Atoi(matches[1])
  
  	response.Description = strings.Trim(matches[2], "")
  
  	if operation.Responses == nil {
  		operation.Responses = &spec.Responses{
  			ResponsesProps: spec.ResponsesProps{
  				StatusCodeResponses: make(map[int]spec.Response),
  			},
  		}
  	}
  
  	operation.Responses.StatusCodeResponses[code] = response
  
  	return nil
  }
docs: // ParseEmptyResponseComment parse only comment out status code and description,eg: @Success 200 "it's ok"