INTERVAL documentation bug?

I believe the documentation (Data Types section) is missing one INTERVAL "field":

     HOUR TO SECOND

http://www.postgresql.org/docs/8.4/static/datatype-datetime.html

The interval type has an additional option, which is to restrict the set of stored fields by writing one of these
phrases:

     YEAR
     MONTH
     DAY
     HOUR
     MINUTE
     SECOND
     YEAR TO MONTH
     DAY TO HOUR
     DAY TO MINUTE
     DAY TO SECOND
     HOUR TO MINUTE
     MINUTE TO SECOND


It's actually supported:

test1=> create table tab1 ( iv interval hour to second );
CREATE TABLE
test1=> insert into tab1 values ( 'PT444H59M59S' );
INSERT 0 1
test1=> select * from tab1;
     iv
-----------
  444:59:59
(1 row)


Seb