The plural does not require an apostrophe.
True; but why limit yourself to plurals? There is always the vexed topic of verbs. If ginger "wants" something, why write "want's"?
He'd (= "he would") be wise to have someone with at least a nodding acquaintance with grammar check all he writes. As he might put it, just a matter of negotian ...... Ooops! Don't we mean "negotiation"?