Missing rooms on map

My map is missing two on the rooms, how can I add the walls?

Perform a zoned cleaning, and set the zone so that some of it is in the area already shown on the map, and the rest of the zone is in the area you want added to the map. This will force the robot to go in there and clean, and it should update on your map. Even if it only shows as a partial room after your zoned cleaning, you can send the robot in there afterwards for a room cleaning and it should discover the entire room.