Documentation is important, but it takes a lot of time and if you are a solo developer, what documentation to you really need? Still, good docs can provide the context I forget after putting a project on the shelf, or explains how to fix something in older code I use, but haven't touched in a long time. So how much is 'enough' documentation and what types of documentation do I need to invest in give my future self the the best value for the effort I put in?