database settings

I am unsure how to add the phpgedview database to settings.php.
The problem is I installed pgv database into the drupal database with the prefix "pgv_".
Should it look like this?

$db_url['default'] = 'mysql://username:password@localhost/databasename'; // drupal db info
$db_prefix = '';
$db_url['phpgedview'] = 'mysql://username:password@localhost/databasename'; // pgv db info
$db_prefix = 'pgv_';