I agree to add comments-capability. Makes sense when having hundreds to thousands of rules. It’s one thing to be the only admin, but another to have multiples and everyone having their hands on changes and no comments on the rules.
In fact, the ability to put comments exists in the options:
-m comment — comment
But it is tedious to type, and because it cannot have space, you need to be careful.
So basically, it is only an input string that will be coded as /* comment */ in the rule.