diff --git a/doc/src/sgml/plpgsql.sgml b/doc/src/sgml/plpgsql.sgml
index c342916..d2e74dc 100644
*** a/doc/src/sgml/plpgsql.sgml
--- b/doc/src/sgml/plpgsql.sgml
*************** BEGIN
*** 2464,2470 ****
              INSERT INTO db(a,b) VALUES (key, data);
              RETURN;
          EXCEPTION WHEN unique_violation THEN
!             -- do nothing, and loop to try the UPDATE again
          END;
      END LOOP;
  END;
--- 2464,2470 ----
              INSERT INTO db(a,b) VALUES (key, data);
              RETURN;
          EXCEPTION WHEN unique_violation THEN
!             -- Do nothing, and loop to try the UPDATE again.
          END;
      END LOOP;
  END;
*************** LANGUAGE plpgsql;
*** 2474,2480 ****
  SELECT merge_db(1, 'david');
  SELECT merge_db(1, 'dennis');
  </programlisting>
! 
      </para>
      </example>
    </sect2>
--- 2474,2483 ----
  SELECT merge_db(1, 'david');
  SELECT merge_db(1, 'dennis');
  </programlisting>
!      This example assumes the <literal>unique_violation</> error is caused by
!      the <command>INSERT</>, and not by an <command>INSERT</> trigger function
!      on the table.  Also, this example only works in the default Read
!      Committed transaction mode.
      </para>
      </example>
    </sect2>