DESCRIBE for composite type?

I've created an composite type.
--
CREATE TYPE requirement_vo AS (
 name VARCHAR(20),
 description VARCHAR(20),
 requirement_id INT,
 requirement_type_id INT,
 priority_id INT,
 necessity_id INT,
 lower_limit DOUBLE PRECISION,
 upper_limit DOUBLE PRECISION
 );
--
How can I get description of this composite type later (field names
and values)? Is there something in pgsql like DESCRIBE statement in
oracle?