-period of time. Since \fIdata direction\fR and \fIoffset\fR are per-IO values,
-they aren't applicable if windowed logging is enabled. If windowed logging
-is enabled and \fBlog_max_value\fR is set, then fio logs maximum values in
-that window instead of averages.
+period of time. Since \fIdata direction\fR, \fIblock size\fR and \fIoffset\fR
+are per-IO values, if windowed logging is enabled they aren't applicable and
+will be 0. If windowed logging is enabled and \fBlog_max_value\fR is set, then
+fio logs maximum values in that window instead of averages.