parent package scope

[Relative newbie to scala]

I have a Database trait and its impl defined as follows:

package com.example.db

trait Database

----

package com.example.db.impl

class DatabaseImpl extends Database

----

I want to restrict access to the impl class to the parent db package.
Is it possible to restrict it so? If yes, does specifying a
private[db] modifier on the impl class suffice?

Thanks,
Keyur