diff --git a/doc/src/sgml/ref/alter_domain.sgml b/doc/src/sgml/ref/alter_domain.sgml
index f6704d7557a..74855172222 100644
--- a/doc/src/sgml/ref/alter_domain.sgml
+++ b/doc/src/sgml/ref/alter_domain.sgml
@@ -41,6 +41,11 @@ ALTER DOMAIN name
RENAME TO new_name
ALTER DOMAIN name
SET SCHEMA new_schema
+
+where domain_constraint is:
+
+[ CONSTRAINT constraint_name ]
+{ NOT NULL | CHECK (expression) }
@@ -79,8 +84,7 @@ ALTER DOMAIN nameADD domain_constraint [ NOT VALID ]
- This form adds a new constraint to a domain using the same syntax as
- CREATE DOMAIN.
+ This form adds a new constraint to a domain.
When a new constraint is added to a domain, all columns using that
domain will be checked against the newly added constraint. These
checks can be suppressed by adding the new constraint using the