I'm a little confused. Is there any ability to comment? I can see the comment toggle on the top right but nothing in the page. I've seen commenting in other O

I'm a little confused. Is there any ability to comment? I can see the comment toggle on the top right but nothing in the page. I've seen commenting in other O'Reilly books [1, 2] but not sure how it works with this one. [1] http://book.realworldhaskell.org/read/ http://book.realworldhaskell.org/read/ [2] https://realworldocaml.org https://realworldocaml.org (also in beta) EDIT: Found this http://chimera.labs.oreilly.com/about http://chimera.labs.oreilly.com/about and also realised I was getting the toggle the wrong way around. "Comments on" means they're on, not 'click to turn them on'. Then you click on a block of text to bring up a comment box.