diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml
index 93ad71737f..4aecefae8a 100644
--- a/doc/src/sgml/syntax.sgml
+++ b/doc/src/sgml/syntax.sgml
@@ -1634,6 +1634,7 @@ SELECT string_agg(a ORDER BY a, ',') FROM table;  -- incorrect
    <note>
     <para>
      The ability to specify both <literal>DISTINCT</literal> and <literal>ORDER BY</literal>
+     at the same time
      in an aggregate function is a <productname>PostgreSQL</productname> extension.
     </para>
    </note>