Check out The Janitor Gets it Right by rogersgeorge. Here is an excerpt:
The rule he gets right has to do with the apostrophe when you want to make a word possessive.
If the word you want to make possessive ends in “s,” just add an apostrophe; don’t add another “s.”
Last panel:
https://www.gocomics.com/tankmcnamara/2019/08/09 But you pronounce the…
The full article is available here.
