doc: mention --segments grouping in dmstats.8.in

diff --git a/man/dmstats.8.in b/man/dmstats.8.in
index def83ca0f5da0d3db38d1a32936f357d718f3ab3..96aca0126187aac13036fe8eaefe6aafabffb55f 100644 (file)
--- a/man/dmstats.8.in
+++ b/man/dmstats.8.in
@@ -460,9 +460,13 @@ optional suffix selects units of:
 .HP
 .BR \-\-segments
 .br
-Create a new statistics region for each target contained in the target
-device. This causes a separate region to be allocated for each segment
-of the device.
+When used with \fBcreate\fP, create a new statistics region for each
+target contained in the given device(s). This causes a separate region
+to be allocated for each segment of the device.
+
+The newly created regions are automatically placed into a group unless
+the \fB\-\-nogroup\fP option is given. When grouping is enabled a group
+alias may be specified using the \fB\-\-alias\fP option.
 .
 .HP
 .BR \-\-statstype