A useful thing to know when using macros is that the letter you press after `q` is just the register in which Vim stores the macro. Registers are also used when

A useful thing to know when using macros is that the letter you press after `q` is just the register in which Vim stores the macro. Registers are also used when copying and pasting. As such, if you want to edit a macro, you can just paste it into a new buffer (e.g., `"ap` for register `a`), edit it as you wish, then copy it back into that register (`:%y a`). You can even use this method to write macros from scratch, rather than recording them first.