Consider a person whose name is "Lehman".
In the sentence
"I read Lehman's documents."
why is it "Lehman's" and not "Lehmans' " ?
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The usual rule applies here - just add
Perhaps you're confused by the fact that it's documents rather than document? It's still Lehman's in both cases. It would be Lehmans' if there were two people called Lehman and the documents belonged to both of them.