diff --git a/core/README.md b/core/README.md
index e7e821cc5..70b81c342 100644
--- a/core/README.md
+++ b/core/README.md
@@ -277,7 +277,7 @@ export default function App() {
       value="console.log('hello world!');"
       height="200px"
       theme={okaidia}
-      extensions={[javascript({ jsx: true })]}
+      extensions={extensions}
     />
   );
 }