company policy vs. company's policy [duplicate]

I’ve been looking over what has been posted regarding the use of ’s.

I used to be a Technical Writer (years ago). The title of one of our training documents was Users’ Guide. Once, a coworker said every time he saw that title he expected users to start coming.

Never made any sense to me, but I have to admit that the majority of us didn't understand the use of s’ in place of ’s. What is the difference?

The difference is in the number of users.

User's guide: A guide belonging to one user.

Users' guide: A guide belonging to all the users.

I'd be inclined to use the first sense rather than the second sense, since the "one" user is really an abstract representation of all the users anyway.

The difference is this: s' is used for plural possessive; 's is used for singular possessive; s' can also be used at the end of proper names that end in s to indicate the possessive without adding the extra s.

Since only one user is likely to be reading a "User's Guide" at a time, it would make sense to use the 's in that title. That may be why your co-worker thought it was funny; possibly he envisioned hordes of people trying to read the document at once.