diff --git a/README.md b/README.md
index 3c6e53c..f292df4 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,7 @@ $ roadhog build
   "extraBabelPlugins": [],
   "autoprefixer": null,
   "proxy": null,
+  "env": null,
 }
 ```