3rd para introduces core.cljs, but then moves to home html. It is something like the 7th para that the code (beginning ns guestbook) is introduced. It was not clear to me where this went and I spent a long time trying to work out what I needed to do. If the 3rd para reference to core.cljs was placed close to the code (or a reminder was given), it would have saved me a lot of effort. Obvious now that I have seen it, but totally baffling to me for about an hour, as I missed the connection!