-currently running and doing io, rate of io since last check, and the estimated
-completion percentage and time for the running group. It's impossible to
-estimate runtime of the following groups (if any).
+currently running and doing io, rate of io since last check (read speed
+listed first, then write speed), and the estimated completion percentage
+and time for the running group. It's impossible to estimate runtime of
+the following groups (if any).