Index: doc/src/sgml/ref/create_domain.sgml
===================================================================
RCS file: /cvsroot/pgsql/doc/src/sgml/ref/create_domain.sgml,v
retrieving revision 1.34
diff -c -c -r1.34 create_domain.sgml
*** doc/src/sgml/ref/create_domain.sgml	3 Apr 2010 07:22:58 -0000	1.34
--- doc/src/sgml/ref/create_domain.sgml	28 May 2010 17:19:35 -0000
***************
*** 121,127 ****
        <term><literal>NOT NULL</></term>
        <listitem>
         <para>
!         Values of this domain are not allowed to be null.
         </para>
        </listitem>
       </varlistentry>
--- 121,132 ----
        <term><literal>NOT NULL</></term>
        <listitem>
         <para>
!         Values of this domain are normally prevented from being null.
!         It is still possible for a domain with this constraint
!         to take a null value if it is assigned a matching domain type
!         that has become null, e.g. via a LEFT OUTER JOIN, or
!         <command>INSERT INTO tab (domcol) VALUES ((SELECT domcol FROM
!         tab WHERE false))</command>.
         </para>
        </listitem>
       </varlistentry>