Can't figure out how to make a ladder

Authoring Inform 7
1

Hi. I’m new with Inform 7, and any kind of programming in general. I vaguely remember reading something in the documentation about ladders, but I can’t find it again. Anyway, here’s the code I have so far:

The ladder is a door.  The ladder is an open door.  It is south of the Artificial Intelligence Core Chamber.  It is south of the Hub. 

The Hub is a room.  It is above the Artificial Intelligence Core Room.

Can someone help me?

EDIT: I just wanted to mention that I haven’t read all the way through the documentation yet, so I apologize if the answer to my problem appears somewhere later in it.

2

You might be thinking of chapter 3.5 in the recipe book and example 43 that discuss staircases, ladders and the such.

3

That did it. Thanks!