shouldn't all tables have Object Descriptions?

We've stumbled upon an issue that we don't understand.  I'm assuming
that any given table should contain 'Object Descriptions.'  For example,
we have two tables as follows:

mwv=# \dd carr;
           Object descriptions
  Schema | Name | Object | Description
--------+------+--------+--------------
  public | carr | table  | Carrier File
(1 row)

mwv=# \dd avlds;
          Object descriptions
  Schema | Name | Object | Description
--------+------+--------+-------------
(0 rows)

Question is, why does the avlds table not have an entry in the Object
descriptions?

--
Until later, Geoffrey

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
  - Benjamin Franklin