Fix typo

Author: AndrewSavetchuk

README.md

@@ -673,7 +673,7 @@ $user->hasPermissionTo('publish articles', 'admin');
 
 > **Note**: When using other than the default `web` guard, you will need to declare which `guard_name` you wish each model to use by setting the `$guard_name` property in your model. One per model is simplest. 
 
-> **Note**: If your app uses only a single guard, but is not `web` then change the order of your listed guards in your `config/app.php` to list your primary guard as the default and as the first in the list of defined guards.
+> **Note**: If your app uses only a single guard, but is not `web` then change the order of your listed guards in your `config/auth.php` to list your primary guard as the default and as the first in the list of defined guards.
 
 ### Assigning permissions and roles to guard users