diff --git a/src/runtime/virtcontainers/qemu.go b/src/runtime/virtcontainers/qemu.go
index 0de579c870..7e7f747fd1 100644
--- a/src/runtime/virtcontainers/qemu.go
+++ b/src/runtime/virtcontainers/qemu.go
@@ -734,6 +734,7 @@ func (q *qemu) CreateVM(ctx context.Context, id string, network Network, hypervi
 		return err
 	}
 
+	// Note: Only virtio-SCSI device driver use this ioThread args.
 	devices, ioThread, kernel, err := q.buildDevices(ctx, kernelPath)
 	if err != nil {
 		return err