# File lib/apipie/validator.rb, line 213
      def param(param_name, *args, &block)
        param_description = Apipie::ParamDescription.new(param_name, *args, &block)
        param_description.parent = self.param_description
        @hash_params_ordered << param_description
        @hash_params[param_name.to_sym] = param_description
      end