The rules of writing states that you're not supposed to add " 's " if there's already an "s" at the end, therefore leaving that edited redundant and your behind pwned.
Thanks, but try again.
Also, rules of writing/grammar do not state any preferred placement of parentheses; usually they are spaced, sometimes they are not. They are used to expressed an inward thought, and as such, whether they are spaced or not; or whether they are there or not doesn't matter anyway as semicolons could take their place.
Don't try Grammar Nazi on a writer, dear. You'll fail. ^^;