Is relpages always supposed to be right?

Is relpages always supposed to be right?:

select count(*) from result_entry;

trend=# select count(*) from result_entry;
 count
-------
 59913
(1 row)

trend=# select relpages from pg_class where relname='result_entry';
 relpages
----------
        0
(1 row)

trend=#


Alex