Ability to add developer comments in components in UX

It gets really heard in complex apps to remember how everything fits together. For instance, I have found that the Delete Row action is quite slow (5 - 10 seconds) which means that I cannot assume that the row is actually deleted. This means I need an error trap somewhere to handle phantom rows.

OK, I get that… but I have been working on the app for 5 weeks, and it has lots and lots of pieces. And a few others have worked on the app.

It would be very useful to have a space for a comment in the UX designer for components - as warnings, let another person know where the component or data is used, etc.