If you have a very pressing need to leave a note in a formula, there are ways of doing that. eg, you can replace some piece(of, code) with:
SwitchIf
SwitchIf("Here is my comment about this code",
piece(of, code)
)
WithName
WithName("comment", Here is a more visible comment without quotes,
piece(of, code)
)
IfBlank (only if the value won’t be blank of course)
piece(of, code).IfBlank("Here is my comment about this code")
etc
It’s not pretty, but it may be useful.