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diff --git a/mtools.texi b/mtools.texi
index bdb3c5d..83676a6 100644
--- a/mtools.texi
+++ b/mtools.texi
@@ -1922,6 +1922,11 @@ byte in each FAT copy. Using this option may confuse DOS or older mtools
version, and may make the disk unreadable. Only use if you know what you
are doing.
+@item b
+Use a non-standard bios disk number for this disk. By default, bios
+disk number is inferred from media descriptor: 0x80 for media
+descriptor 0xf8, or 0x00 otherwise.
+
@end table
To format a diskette at a density other than the default, you must supply