This tip is from big wall expert Mark Hudon. See more great tips and El Cap route photos at his website, hudonpanos.com

When the leader gets close to the anchor, they yell down to the belayer, “25 feet” and an estimate of the time it might take to get there. This signals the belayer to wake up from their nap (napping, one of the joys of big wall belaying with a Grigri), start breaking down the anchor, make sure the haul bag is ready to be released, get ready to clean, etc.