Advance flows: MouseOver/hoover notes

When revisiting old advanced flows, I sometimes wonder why I made certain cards/decisions. I know i can add notes into the advanced flow, but it tends to clutter the more complicated flows, making them harder to read. I’d love an option to add (by contextual menu, perhaps) a short note which appears when I just hoover over the card. This will keep the advance flow board neat and empty, while still providing an option to add comments.

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Additional, it’s nice have the current notes in background, and flow parts in foreground.
So notes become readable only when hovering or selecting.