From 'man tar' on debian:
BUGS
 The GNU folks, in general, abhor man pages, and create info documents instead. Unfortunately, the info document describâ
ÂÂÂÂ ing tar is licensed under the GFDL with invariant cover texts, which makes it impossible to include any text from that
 document in this man page. Most of the text in this document was automatically extracted from the usage text in the
 source. It may not completely describe all features of the program.