adding comments to a table

Howdy:

Running PostgreSQL 7.2.1 on RedHat Linux 7.2.

I have a table where I'm the owner, but I want to give
all permission to another person. So, I do a
'grant all on <table> to <joe_user>' and it seems that
they have all the rights that I do.

But they are not able to add a comment to the table.

Is this a table creator-only ability? How can I give
the new person the ability to add a comment to
the table?

Thanks!

-X