Whitelist sub-domain and domain Squid Guard3

[Wuebit]

Howdy. Ive got the whitelist working in squid guard fine for whole domains example foo.com

But how can I allow all sub-domains from that domain

help.foo.com
hi.foo.com
readme.foo.com

I added .foo.com into the whitelist thinking this might work but it came up with the error saying it was not a domain

The following input errors were detected:

DEST 'myWhitelist': Item '.foo.com' is not a domain.

[finalcut]

try to choose allow instead of whitelist
and make sure that website aren't in some of squidguard blocked list