Update documentation on net engine port usage
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fio.1 b/fio.1
index 9ddf101..8d02632 100644
--- a/fio.1
+++ b/fio.1
@@ -1471,7 +1471,9 @@
used and must be omitted unless it is a valid UDP multicast address.
.TP
.BI (net,netsplice)port \fR=\fPint
-The TCP or UDP port to bind to or connect to.
+The TCP or UDP port to bind to or connect to. If this is used with
+\fBnumjobs\fR to spawn multiple instances of the same job type, then
+this will be the starting port number since fio will use a range of ports.
.TP
.BI (net,netsplice)interface \fR=\fPstr
The IP address of the network interface used to send or receive UDP multicast