In my case, the words help with self-documenting; knowing why I'm doing the calculations I'm doing. I feel like over time, I spend a lot of time going over old

In my case, the words help with self-documenting; knowing why I'm doing the calculations I'm doing. I feel like over time, I spend a lot of time going over old Excel spreadsheets exploring the formulas I've put together and wondering what I was thinking, re-learning how they work, wishing I had something there to explain it that is more than just those "Attach notes to cell" things. In some of my spreadsheets, I've actually taken to writing docs in a separate markdown app, and then taking screenshots of the rendered pdf and pasting them into Excel. It's clunky.