diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 234ccb70e1c..41acda003f9 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -85,6 +85,17 @@ ALTER TABLE [ IF EXISTS ] name
OWNER TO { new_owner | CURRENT_USER | SESSION_USER }
REPLICA IDENTITY { DEFAULT | USING INDEX index_name | FULL | NOTHING }
+and table_constraint is:
+
+[ CONSTRAINT constraint_name ]
+{ CHECK ( expression ) [ NO INHERIT ] |
+ UNIQUE ( column_name [, ... ] ) index_parameters |
+ PRIMARY KEY ( column_name [, ... ] ) index_parameters |
+ EXCLUDE [ USING index_method ] ( exclude_element WITH operator [, ... ] ) index_parameters [ WHERE ( predicate ) ] |
+ FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable [ ( refcolumn [, ... ] ) ]
+ [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ] [ ON DELETE action ] [ ON UPDATE action ] }
+[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
+
and table_constraint_using_index is:
[ CONSTRAINT constraint_name ]