syslog.conf syntax to specify several clients

Hi all,

I have a server that acts as a syslog aggregator
for several other servers. I was trying to see whether
clients can be specified on one line but I can't see anything 
regarding syntax for such cases in man pages.

Do we need to specify each client on the separate line?
Like:

+server1
*.blah /some/dir

+server2
*.blah /some/dir

Or can we do something like this?
+server1, +server2
*.blah /some/dir

or

+server1,server2
*.blah /some/dir

I tried several kinds of semicolon, comma and plus syntax
but have not being able to make it work.
I can only see the very first host (eg. server1) in the log, not others.