-compression ratio. Compared to the default \fB--recompress\fR, this will make
-compression about twice as slow and will increase the compression ratio by maybe
-1%, depending on the data. This option implies \fB--recompress\fR and
-\fB--compress\fR=\fImaximum\fR (recompress using LZX compression).
+compression ratio. For LZX ("maximum") compression, compared to the default
+\fB--recompress\fR this will make compression about twice as slow and may
+improve the compression ratio by maybe 1%, depending on the data. For LZMS
+("recovery") compression this option also has an effect. For XPRESS ("fast")
+compression this option has no effect; however you may use \fB--compress\fR=LZX
+\fB--recompress-slow\fR to change the compression type to LZX and recompress
+slowly, as per this option. In any case, this option implies
+\fB--recompress\fR.