diff --git a/README.md b/README.md
index 944f223..c32453f 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ npm install vue-google-auth
 ```
 import GoogleAuth from 'vue-google-auth'
 
-Vue.use(GoogleAuth, { clientID: 'xxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com' })
+Vue.use(GoogleAuth, { client_id: 'xxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com' })
 Vue.googleAuth().load()
 ```
 Ideally you shall place this in your app entry file, e.g. src/main.js