-@item --rsyncable
-While compressing, synchronize the output occasionally based on the
-input. This can reduce the compression slightly in some cases, but
-means that the @code{rsync} program can take advantage of similarities
-in the uncompressed input when syncronizing two files compressed with
-this flag. @code{gunzip} cannot tell the difference between a
-compressed file created with this option, and one created without it.
-