pg_stat_activity reporting of VACUUM in 8.1

Hi all;

looking at a system running 8.1.15
via a select from pg_stat_activity I see a row where the vcurrent_query =
'VACUUM'

I see also that autovacuum is on. Would autovacuum be running a vacuum on the
entire db? I didn't think autovacuum did that. If not, how do I know in
version 8.1 what table is being vacuumed? I thought that even in 8.1 the
current_query column in pg_stat_activity would list the full sql being run as
opposed to 'VACUUM'.

Thanks in advance