docs: function(missingParams) {
        var errParts = [];
        missingParams = _.map(missingParams, function(missingParam) {
          return '`' + missingParam + '`';
        });
        errParts.push("Missing");
        errParts.push(missingParams.join(', '));
        errParts.push("parameter(s).");
        return new MuniError(errParts.join(' '), 400);
      }