index creation in maintenance_work_mem or work_mem

Hi,

When I read doc, http://www.powerpostgresql.com/PerfList/, I am confused by:

“maintenance_work_mem: formerly called vacuum_mem, this is the quantity of RAM PostgreSQL uses for VACUUM, ANALYZE, CREATE INDEX, and adding foriegn keys.”

Is this right? I thought work_mem (or sort_mem prior 8) is used for CREATE INDEX.

Thanks