diff --git a/doc/src/sgml/ref/create_domain.sgml b/doc/src/sgml/ref/create_domain.sgml
index 6a8401a62b3..b7d5e606d3e 100644
--- a/doc/src/sgml/ref/create_domain.sgml
+++ b/doc/src/sgml/ref/create_domain.sgml
@@ -1,5 +1,5 @@
@@ -108,9 +108,7 @@ where constraint is:
NOT NULL>
- Values of this domain are not allowed to be NULL. This is
- equivalent to the column constraint CHECK (column NOT NULL).
+ Values of this domain are not allowed to be NULL.