How to create View Composer for view in subdirectory in PHP Laravel 5

I am trying to create a View Composer in PHP Laravel 5. I have organized my template layouts like this

resources/
  views/
     layouts/
       master2.blade.php
     index.blade.php
     master1.blade.php

I have already successfully register a composer for master1 by calling

view()->composer('master1', function ($view) { });

but, how to create one for master2 ?

I have tried both:

view()->composer('layouts.master1', function ($view) { });
view()->composer('layouts/master1', function ($view) { });

but none of them work.

via Chebli Mohamed