[Samba] "valid user" <-> "valid userS"

[Mona Meyer]

I was trying to set up a samba server (3.0.24-6etch10) on Debian etch
with Windows NT Authorization.

I wanted to give only a specific windows-group read and write authorization:

/etc/samba/smb.conf:

[test]
(...)
valid user = @users

As this did not work, I compared the configfile with another working
samba-server of mine, and changed it to

valid userS= @users

After that, everything worked, but as far as I understood the manpages
it should be "user" (no plural).

Is this a bug, or did I miss something?