diff --git a/tests/conf/modelnet-test.conf b/tests/conf/modelnet-test.conf
index a88a0eb63bf7c4af175aee3e9887e4566ddac3f9..154b21dc7f0fca4514de37e806065cdd6818a11c 100644
--- a/tests/conf/modelnet-test.conf
+++ b/tests/conf/modelnet-test.conf
@@ -16,5 +16,6 @@ PARAMS
    modelnet_scheduler="fcfs";
    # modelnet_scheduler="round-robin";
    net_startup_ns="1.5";
+   # bandwidth is in MiB/s
    net_bw_mbps="20000";
 }