diff --git a/packages/nomodule-plugin/README.md b/packages/nomodule-plugin/README.md
index 091305503..c8322b19b 100644
--- a/packages/nomodule-plugin/README.md
+++ b/packages/nomodule-plugin/README.md
@@ -7,7 +7,7 @@ New browsers get the new stuff, old browsers get the old stuff.
 
 ## Usage
 
-Add this to your `wmr.config.js`:
+Add this to your `wmr.config.mjs`:
 
 ```js
 import nomodule from '@wmrjs/nomodule';