Display alphabetically

In my model Feedback I have to retrieve the names of my students in alphabetical order.

Do know you where I must to include this line on my code? orderBy('name', 'ASC').

I had several times a synthax problem...

public function index(Request $req) 
    {

    if ($req->search == "") {
        $feedbacks = Feedback::paginate(5);
        return view('admin.feedbacks.index', compact('feedbacks'));

    } else {

        $validated = $req->validate([
            'search' => 'alpha', 
        ]);

        $feedbacks = Feedback::whereHas('students', function($query) use($req) {
            $query->where('name', 'like', '%' . $req->search . '%');
        })->paginate(5);

        return view('admin.feedbacks.index', compact('feedbacks'));
        }

    }

via Chebli Mohamed