-* Fix tar so that it can read and write POSIX.1-1990 tar archives.
-
-* Add support for POSIX 1003.1-2001 tar archives
- (along with technical corrections to the standard since 2001).
+* Add support for GNU private keywords in POSIX 1003.1-2001 headers,
+so that the GNU extensions (--sparse, --incremental, --label and
+--multi-volume) may be used with POSIX archives.