---
 multipath/multipath.8 |    2 ++
 1 file changed, 2 insertions(+)

Index: multipath-tools/multipath/multipath.8
===================================================================
--- multipath-tools.orig/multipath/multipath.8
+++ multipath-tools/multipath/multipath.8
@@ -75,6 +75,8 @@ is in. 
 is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format.
 .I device
 may alternatively be a multipath mapname
+.SH NOTES
+a map may be unused if, eg, the file system on it is not mounted or there are no open file descriptors against the device file, as in a raw device.
 .SH "SEE ALSO"
 .BR udev (8),
 .BR dmsetup (8)