Wilfred Hughes’ Emacs Command of the Day Twitter feed has a useful tip:
Have you ever created a great keyboard macro, but wanted to add a few more keystrokes at the end?
`C-u F3` will run the keyboard macro, and start recording any additional keystrokes until you press F4!https://t.co/aa9aBz3zn0
— Ⓔ Command of the Day (@ecotd) January 16, 2022
I’ve seen this before and may even have written about it before but I always forget about it. I’m not sure why; it could hardly be simpler: just prefix the start macro command with the universal argument.
In any event, it’s a useful reminder for me and may be for you too.