[build@client11 ~]$ tar tjvf tar-1.22.tar.bz2 |grep README -rw-r--r-- gray/users 2524 2008-04-14 08:03:13 tar-1.22/tests/star/README -rw-r--r-- gray/users 9692 2007-06-27 09:30:31 tar-1.22/README [build@client11 ~]$ tar xjvf tar-1.22.tar.bz2 tar-1.22/README tar-1.22/README [build@client11 ~]$ cat tar-1.22/README README for GNU tar See the end of file for copying conditions. ... GNU `tar' saves many files together into a single tape or disk archive, and can restore individual files from the archive. It includes multivolume support, the ability to archive sparse files, automatic archive compression/decompression, remote archives and special features that allow `tar' to be used for incremental and full backups. This distribution also includes `rmt', the remote tape server. The `mt' tape drive control program is in the GNU `cpio' distribution. ...You end the %description section by starting another section (%pre, %post, %prep, %build), the usual layout is to do %prep next.
In this section you add a long description of the package. If your package has a README you can usually find a good description in there, otherwise maybe some snippet from the homepage of the project will do. In our case we'll use the description from the README.