Passing parameters to controller in laravel 5?

I am new to Laravel and SO.

I am using Laravel 5 in one of my project and I want to pass some value to controller from route (web.php).

My code looks like:

Route Definition:

Route::get(Config::get('constant.ROUTES.UPLOADS'), 'UploadsController@index');

Value of constant

'UPLOADS' => '/images/{filename}'

Controller

class UploadsController extends Controller
{
    function index($filename) {
        //Some code here
    }
}

Error

ErrorException in UploadsController.php line 9:
Missing argument 1 for metacubewebsite\Http\Controllers\UploadsController::index()

Can anyone help me on this?

via Chebli Mohamed