Added runtime req for iperf3

README.md

@@ -13,7 +13,8 @@ Currently there is no installation method other than downloading the provided re
 Simply run the tool with `./bgbench` and you'll be presented with the available subcommands.
 
 ### Runtime requirements:
-* disk - requires `fio`.
+* `disk` - requires `fio`.
+* `network bandwidth` - requires `iperf3`
 
 ## Building