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-rw-r--r--doc/src/sgml/ref/select.sgml7
1 files changed, 5 insertions, 2 deletions
diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml
index 211e4c320ce..57f11e66fb6 100644
--- a/doc/src/sgml/ref/select.sgml
+++ b/doc/src/sgml/ref/select.sgml
@@ -603,9 +603,12 @@ TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ]
<varlistentry>
<term><literal>NATURAL</literal></term>
<listitem>
- <para><literal>NATURAL</literal> is shorthand for a
+ <para>
+ <literal>NATURAL</literal> is shorthand for a
<literal>USING</> list that mentions all columns in the two
- tables that have the same names.
+ tables that have matching names. If there are no common
+ column names, <literal>NATURAL</literal> is equivalent
+ to <literal>ON TRUE</>.
</para>
</listitem>
</varlistentry>