diff --git a/index.php b/index.php
index aabd3d0..f41eaa2 100644
--- a/index.php
+++ b/index.php
@@ -27,7 +27,7 @@ $machineArgs = array(
         'type' => 'string',
         'pattern' => '/^[a-zA-Z0-9\-_]+$/',
         'repeatable' => false,
-        'optional' => false
+        'optional' => true
     ),
     'network' => array(
         'type' => 'string',