Is this documentation complete? https://docs.umbraco.com/umbraco-cms/extending/section-trees/trees#registering-a-tree not really sure what it is saying...

I'm guessing not - Looks to be still a work in progress https://cdn.discordapp.com/attachments/1245290978059747408/1245295498697510932/image.png?ex=66583b4f&is=6656e9cf&hm=a5499c17b29c57980632398fb900bd0170b1fda664134685df7f40f6691723ca&

Normally the articles have a disclaimer indeed this one didn't..

The disclaimer is at the top of that page you linked 🙂

Oh serious?? I really need a holiday, just 2 more hours 🙂

😄 Ye, I think your link take you to an anchor, but if you scroll up a bit, it's there 😄 Enjoy the holiday 😄