How do I list the constraints of a DOMAIN?

Consider the following scenario: CREATE DOMAIN dom_zipcode AS text; ALTER DOMAIN dom_zipcode ADD CONSTRAINT zipchk CHECK (char_length(VALUE) = 5); Now, if I want to drop that constraint with ALTER DOMAIN , The manual says : ALTER DOMAIN name DROP CONSTRAINT [ IF EXISTS ] constraint_name [ RESTRICT | CASCADE ] But how can we find constraint_name? \dD only shows the constraint's definition (CHECK statement). \dD dom_zipcode ; List of domains Schema | Name | Type | Modifier | Check --------+-------------+------+----------+-------------------------------- public | dom_zipcode | text | | CHECK (char_length(VALUE) = 5) (1 row) I can dump the schema using pg_dump, but I believe there must exist a more elegant way to establish this using the psql terminal.