++@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.
++
++@item --rsyncable
++While compressing, synchronize the output occasionally based on
++the input. This increases size by less than 1 percent most
++cases, but means that the @command{rsync} program can much more efficiently
++synchronize files compressed with this flag. @command{gunzip}
++cannot tell the difference between a compressed file created
++with this option, and one created without it.
++