Prephecies-Nightfall

Hey, I was just wondering, that if I buy Nightfall, and link the two games together, do I still have just four character slots, or do I gain an extra four slots from nightfall?

For every chapter that you add on to your first chapter game, you gain 2 character slots.

Check out:
http://www.guildwars.com/support/faq/
if you need more details or have other similar questions.

Thank you.