Software documentation itself is often regarded as “not so important” and writing documentation is often viewed as a chore that “just needs to be done”. Consequently, the documentation of software libraries tends to be neglected which results in low documentation quality. However, good software documentation is crucial for explaining which issues your library addresses and how it addresses them, for a positive user experience, and also for attracting and retaining contributors. In this talk you will learn how to write good software documentation, including which details your documentation needs to cover, how to create engagement with users and contributors, and how you can improve your code through documentation. Additionally, you will learn how to make writing software documentation more fun for yourself and other contributors, so you don’t feel like writing it is like doing your taxes - a boring and tedious task that you procrastinate on and prefer to outsource.