The 2am Test

Here's how you know your documentation is good enough: could someone (or you at 2am when something is broken) understand this workflow well enough to fix it without context?

Not every question answered. Not a manual. But enough to understand what it does, where the data comes from, and where to look if something breaks.

If you're reading documentation you wrote six months ago and thinking "that's completely unclear," you've found what to improve for the next workflow.