The extension/annex is a great way to add an extra living room/kitchen or kids room. The extension attaches to the base of the tent along a rope rail then easily zipped around taking no more than a couple minutes to fit. The extension comes with 4 doors, 2x side doors, large rear door (half moon) to access the vehicle and a large front door. We have also added a great awning that extends out the front that includes two poles and ropes, so you can close the door and still have awning up.