Description of problem: The manual page for tar(1) is not up-to-date. It should document features such as --lzma, --xz (-J), --auto-compress (-a) etc. There may be other missing things from the man page too, I didn't check. Version-Release number of selected component (if applicable): tar-1.22-8.fc12.i686
Thanks for report, you are right - it's not up2date - tar ships only info documentation by default, man page is maintained by Red Hat and was not touched for quite a long time ... so I'll try to update it in next tar build.
tar-1.22-10.fc12 has been submitted as an update for Fedora 12. http://admin.fedoraproject.org/updates/tar-1.22-10.fc12
tar-1.22-10.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update tar'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2009-12387
tar-1.22-10.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.