.BR \-a ", " \-\-add
hot-add listed devices.
If a device appears to have recently been part of the array
-(possibly it failed or was removed) the device is re-added as describe
+(possibly it failed or was removed) the device is re\-added as describe
in the next point.
If that fails or the device was never part of the array, the device is
added as a hot-spare.
it will be assumed that bitmap-based recovery is enough to make the
device fully consistent with the array.
+When
+.B \-\-re\-add
+can be accompanied by
+.BR \-\-update=devicesize .
+See the description of this option when used in Assemble mode for an
+explanation of its use.
+
If the device name given is
.B missing
then mdadm will try to find any device that looks like it should be