I have various time-consuming plans for the next few weeks and also need to do quite a bit of reading if I’m to put together a decent update for the Teach Yourself Logic guide for 2016. Hence work on revising the category theory notes — already going at, shall we say, a rather gentle pace — will no doubt slow even more. So I thought I would put online the current version of Category Theory: A Gentle Introduction even though it doesn’t reach a natural break point. So far then, the now fourteen chapters (123 pp.), after introducing categories, consider limits and exponentials (constructions *within* categories) before moving on to start talking about functors (maps *between* categories). The category theory page here indicates which chapters to then read in the old notes, if you are feeling suitably enthused!