如何使用NSFetchedResultsController重新启动查询

I'm finishing up the Core Data tutorial, and it suggests trying to convert to using a NSFetchedResultsController. So I've got it so that I can query the existing data, but when I add a row at the beginning, tableView:cellForRowAtIndexPath calls NSFetchedResultsController.objectAtIndexPath, but that still returns the old zeroth object instead of the new one. Is there something I need to do to flush that data?I'm finishing up the Core Data tutorial, and it