max_fsm_relations

PostgreSQL 8.1.3 (windows), 8.1.9 - 8.1.10 (linux).
I have databases, what are vacuumed using cron very regularry (vacuumdb
-a -f ...) and I know when should do this. Automatic vacuuming is off.
There are thousands of tables in one cluster (for ex. 10000). If I do
vacuuming manually, I can see the warning:
NOTICE:  max_fsm_relations(1000) equals the number of relations checked
HINT:  You have at least 1000 relations.  Consider increasing the
configuration parameter "max_fsm_relations".
But all is working properly. Do I need really to increase
max_fsm_relations (and corresponding start values) for postgresql server
? If I should "to consider" only it looks, that it is  not needed in my
situation. I'm right ?
Brgds
Adam