diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 2d639a66af..bc5dcba59c 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -135,6 +135,10 @@ WITH ( MODULUS numeric_literal, REM
exclude_element in an EXCLUDE constraint is:
{ column_name | ( expression ) } [ opclass ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ]
+
+referential_action in a FOREIGN KEY/REFERENCES constraint is:
+
+{ NO ACTION | RESTRICT | CASCADE | SET NULL | SET DEFAULT }
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index 61a584fa34..57d51a676a 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -105,6 +105,10 @@ WITH ( MODULUS numeric_literal, REM
exclude_element in an EXCLUDE constraint is:
{ column_name | ( expression ) } [ opclass ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ]
+
+referential_action in a FOREIGN KEY/REFERENCES constraint is:
+
+{ NO ACTION | RESTRICT | CASCADE | SET NULL | SET DEFAULT }