Ah yes you're right, step 860 is the one, but since it is listed so far back in the sequence, I would have at least put a reference to it at the start of step 879, as they did in other parts of the walkthroughAs I'm not involved in creating the walkthrough, I don't have that much say on it
but you're right
I think they left since it's automatic.
EDIT: Check step 860