Example of a function taking a composite type should show how to call it.

doc/src/sgml/plpgsql.sgml

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 <chapter id="plpgsql"> 
@@ -685,6 +685,8 @@ BEGIN
     RETURN in_t.f1 || use_t.f3 || in_t.f5 || use_t.f7;
 END;
 ' LANGUAGE plpgsql;
+
+SELECT use_two_tables(t.*) FROM tablename t WHERE ... ;
 </programlisting>
    </para>
   </sect2>