diff --git a/README.md b/README.md
index d15fcc4..b9f4f67 100644
--- a/README.md
+++ b/README.md
@@ -6,5 +6,6 @@ To build and run the prototype, run:
 
 ```
 npx tsc
+echo  '{"type": "module"}' > obj/package.json
 node obj
 ```