Returning schema name with table name

SELECT oid, relname::char(35) as Table_Name,
       pg_size_pretty(pg_total_relation_size(oid))::VARCHAR(15) as
Total_Table_Size
FROM pg_class
 where  pg_total_relation_size(oid)/(1024*1024)>0
 ORDER BY pg_total_relation_size(oid) desc

returns table names with size greater than 1 MB

How to modify this so that schema name is also returned?
I have lot of tables with same name and thus this output is difficult to
understand.
pg_class seems not contain schema names.

Andrus.