diff --git a/website/js/repl.js b/website/js/repl.js
index 7e8faa376c..8acc3c362e 100644
--- a/website/js/repl.js
+++ b/website/js/repl.js
@@ -44,6 +44,12 @@ var optionsConfig = [
     defaultVal: "browser",
     description: "The target environment for Prepack"
   },
+  {
+    type: "string",
+    name: "lazyObjectsRuntime",
+    defaultVal: "",
+    description: "Enable lazy objects feature and specify the JS runtime that supports this feature."
+  },
   {
     type: "boolean",
     name: "omitInvariants",