When you go to the tracklist part of /release/add, you get confronted with the tracklist parser:

This box doesn't actually contain any information about the format it's expecting, nor does it link to somewhere explaining what's going on, which can lead to confusion and a feeling of being lost for new users. (See e.g., https://community.metabrainz.org/t/new-and-dreadfully-confused-adding-audiobook-multi-disc-new-release-groups/216864/10?u=freso )

This should be documented either directly on/in the "box" or in the documentation system and be linked to from/in the box.