Possessive Apostrophe
https://www.grammar-monster.com/lessons/apostrophes_show_possession.h…Getting ready... More about Using Apostrophes for Possession Do not get tied up with thinking about whether the word is singular or plural. When using an apostrophe to show possession, the first thing to check is whether the possessor (i.e., the noun that will become a possessive noun) already ends -s.If the word is singular, then it will probably not end -s, but it might (e.g., "Moses").