child table doesn't inherit PRIMARY KEY?

When creating a child (through CREATE TABLE ... INHERIT (parent)) it
seems the child gets all of the parent's contraints _except_ its PRIMARY
KEY. Is this normal? Should I add a PRIMARY KEY(id) statement each time
I create an inherited table?

Cheers,

--
Louis-David Mitterrand - ldm@apartia.org - http://www.apartia.fr

If at first you don't succeed, redefine success.