.I zip
can be uncompressed by gzip only if they have a single member compressed
with the 'deflation' method. This feature is only intended to help
-conversion of tar.zip files to the tar.gz format. To extract zip files
+conversion of tar.zip files to the tar.gz format. To extract a
+.I zip
+file with a single member, use a command like
+.I "gunzip <foo.zip"
+or
+.IR "gunzip -S .zip foo.zip" .
+To extract zip files
with several members, use
.I unzip
instead of
.I gzip
preserves the mode, ownership and timestamps of files when compressing
or decompressing.
+.PP
+The
+.I gzip
+file format is specified in P. Deutsch, \s-1GZIP\s0 file format
+specification version 4.3, <ftp://ftp.isi.edu/in-notes/rfc1952.txt>,
+Internet RFC 1952 (May 1996). The
+.I zip
+deflation format is specified in P. Deutsch, \s-1DEFLATE\s0 Compressed
+Data Format Specification version 1.3,
+<ftp://ftp.isi.edu/in-notes/rfc1951.txt>, Internet RFC 1951 (May 1996).
.SH OPTIONS
.TP
compresses better than
.I gzip.
.SH "COPYRIGHT NOTICE"
-Copyright \(co 1998, 1999, 2001 Free Software Foundation, Inc.
+Copyright \(co 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
.br
Copyright \(co 1992, 1993 Jean-loup Gailly
.PP