Laravel and PHPSTORM auto code hint

I have a class that return a collection

public function getCustomers() : Collection;

When I loop the result, the PHPSTORM IDE won't know what's inside the collection.

in .NET/JAVA you will write

public <List<Customer>> getCustomers();

then the IDE will knows whats inside the collection and know how to complete/hint that.

Is there any trick to ontroduce that that to PHPSTORM?

Thanks

via Shazam