Many users will probably follow best practice style guides with Alteryx to use comment boxes under tools to describe in detail what is happening with these tools - such as this one shared by @BenMoss.
However a limitation of this is the comment boxes do not move with the tools, so if you have a well documented workflow but then need to add a new tool, you need to adjust all the spacing and re-align the tools, which with a large workflow can be time consuming.
Therefore the improvement would be to have an ability to lock comment boxes to individual tools (similar to a group function in Office).