Missing Method in DisplayController

Error: The action category is not defined in controller DisplayController

Error: Create DisplayController::category() in file: app/controllers/display_controller.php.

<?php
class DisplayController extends AppController {

	var $name = 'Display';


	function category() {

	}

}
?>

Notice: If you want to customize this error message, create app/views/errors/missing_action.ctp