# File lib/apipie/validator.rb, line 201
      def param(param_name, validator, desc_or_options = nil, options = {}, &block)
        param_description = Apipie::ParamDescription.new(param_name, validator, desc_or_options, options, &block)
        param_description.parent = self.param_description
        @hash_params_ordered << param_description
        @hash_params[param_name.to_sym] = param_description
      end