Documentation update
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/fio.1 b/fio.1
index cabff41..190da4f 100644
--- a/fio.1
+++ b/fio.1
@@ -199,7 +199,9 @@
Total size of I/O for this job. \fBfio\fR will run until this many bytes have
been transfered, unless limited by other options (\fBruntime\fR, for instance).
Unless \fBnr_files\fR and \fBfilesize\fR options are given, this amount will be
-divided between the available files for the job.
+divided between the available files for the job. If not set, fio will use the
+full size of the given files or devices. If the the files do not exist, size
+must be given.
.TP
.BI fill_device \fR=\fPbool
Sets size to something really large and waits for ENOSPC (no space left on