does editing card details or amount update subscription?

Once an authorize.net subscription has been added, does editing the subscription amount or credit card in the admin update the subscription? I'm guessing it does not. My clients were confused and believed that it did. (and if it doesn't then a note would be helpful explaining that no connection exists). also editing the subscription before the transaction is settled vs. after will make a difference.

Thanks. a note stating that editing the card is fruitless might be helpful. my client tried to update the card that way because it seems as if you could because you can edit the details.