How to retrieve a comment/description from a table - Mailing list pgsql-general

Hello!
This psql command is very straight forward and promising:
COMMENT ON mytable IS 'This is my table.';

But how can I retrieve the particular comment from that table again?
Using \d+ gives you all the tables with their comments. I want a special
one.

And if that is not possible, can the \d+ results be obtained from a
system table or so?

Thanks,
Marcus