Client Tools :: Script To Describe Tables?

how to create a script that will describe only the structure of 150 tables of a database.have it just like this, but I cannot produce the name of the table:

spool desctab.sql
select 'desc '||owner||'.'||table_name||'' from all_tables where owner='SKIMA'
order by table_name;
spool off

.. the output of the spool file is something like this:

Name Null? Type
----------------------------------------- -------- -------------
OFC_CODE VARCHAR2(3)
OFFICE VARCHAR2(35)
DESCRIPTION VARCHAR2(50)
REMARKS VARCHAR2(200)
OFFICER VARCHAR2(35)