Need help adding a disambiguation notice

I just split Tao Te Ching: Annotated & Explained out from the main Tao Te Ching entry. It's a translation by Derek Lin with a lot of extra notes on translation/etc added on, to the point that only a sliver of the actual book contents is the Tao Te Ching. I would like to add a disambiguation notice to make sure they don't get combined again, but I can't seem to figure out how...? I don't know if I just keep missing the option or if it's not there for me at all. Thanks in advance!

I see ir in CK, as normal. Just harder to find since CK has been reordered.

It's in the middle of the Common Knowledge section.

I'd also add a work-to-work relationship. Disambiguation notices can be ignored.