code: public static function add($classname, $columns = array(), $title = null)
      {
          if ($title) {
              Deprecation::notice(1.1, "Title is no longer used, instead set ClassName.PluralName in translations");
          }
  
          self::config()->objects[$classname] = $columns;
  
          $cols_string = '"' . implode('","', $columns) . '"';
      }
docs: Add an object to the Searchable module, this object will
  automatically be added to the results page dashboard
  
  @param $classname Classname of the object we want to search
  @param $columns An array of database column names we will search
  @param $title The title of this object (that will appear in the dashboard)