HOWTO: add comment on terse and --minimal

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/HOWTO b/HOWTO
index 5e5b212..178bc98 100644
--- a/HOWTO
+++ b/HOWTO
@@ -948,6 +948,8 @@
 client1;0;0;1906777;1090804;1790;0;0;0.000000;0.000000;0;0;0.000000;0.000000;929380;1152890;25.510151%;1078276.333333;128948.113404;0;0;0;0;0;0.000000;0.000000;0;0;0.000000;0.000000;0;0;0.000000%;0.000000;0.000000;100.000000%;0.000000%;324;100.0%;0.0%;0.0%;0.0%;0.0%;0.0%;0.0%;100.0%;0.0%;0.0%;0.0%;0.0%;0.0%
 ;0.0%;0.0%;0.0%;0.0%;0.0%
 
+To enable terse output, use the --minimal command line option.
+
 Split up, the format is as follows:
 
 	jobname, groupid, error