diff --git a/components/engine/docker/docker.go b/components/engine/docker/docker.go
index fb7c465369..2db50bf328 100644
--- a/components/engine/docker/docker.go
+++ b/components/engine/docker/docker.go
@@ -28,7 +28,7 @@ func main() {
 	flDaemon := flag.Bool("d", false, "Daemon mode")
 	flDebug := flag.Bool("D", false, "Debug mode")
 	flAutoRestart := flag.Bool("r", false, "Restart previously running containers")
-	bridgeName := flag.String("b", "", "Attach containers to a pre-existing network bridge")
+	bridgeName := flag.String("b", "", "Attach containers to a pre-existing network bridge. Use 'none' to disable container networking")
 	pidfile := flag.String("p", "/var/run/docker.pid", "File containing process PID")
 	flGraphPath := flag.String("g", "/var/lib/docker", "Path to graph storage base dir.")
 	flEnableCors := flag.Bool("api-enable-cors", false, "Enable CORS requests in the remote api.")