Is there a way to implicitly grant privileges to an implicitly created sequence?

Hi there,
if I use the datatype serial in a table it implicitly creates a sequence.
If I grant INSERT to a user on this table he still can't insert data as
he doesn't have the right privileges on the implicitly created sequence.
Is this a bug or a feature?
Is there a way to implicitly grant the right privileges to this sequence
wihtout having to know it's name?

Regrards,
Brar Piening