-\fB\-i\fR, \fB\-\-index\fR=\fISTART_MDT_INDEX\fR
-Stripe from the MDT, whose index is
-.I START_MDT_INDEX.
+.BR \-i ", " \-\-mdt\-index =\fISTART_MDT_INDEX\fR[,\fIMDT_INDEX ...]
+Use the MDT whose index is
+.I START_MDT_INDEX
+as the master/starting MDT for the directory. If multiple
+.I MDT_INDEX
+values are given, then the stripes will be allocated on the specified
+MDT indices. If index -1 (default) is used, it will prefer to select
+.B COUNT
+MDTs proportional to the free space and inodes on each.