does vacuum reclaim unused space from an index ???

Hi all,
I've a small table (3000 rows) that it's UPDATEd very frequently.

create table myTable(theKey char(6) primary key, theMsg varchar(256));

Of course pgSQL does create an index on theKey, to give
me referential integrity: it seems to me that when I do
a vacuum to reclaim unused space and to speed-up the
usage of the table, the index file size is unchanged,
and so it's getting slower the update process.

Anyone may confirm me this is the default behaviour ???

TIA
/gp

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