diff --git a/README.md b/README.md
index 01b35b5dc..c45df1cfb 100644
--- a/README.md
+++ b/README.md
@@ -162,8 +162,8 @@ const client = generator('mastodon', BASE_URL)
 
 client.registerApp('Test App')
   .then(appData => {
-    clientId = appData.clientId
-    clientSecret = appData.clientSecret
+    clientId = appData.client_id
+    clientSecret = appData.client_secret
     console.log('Authorization URL is generated.')
     console.log(appData.url)
   })
@@ -177,11 +177,11 @@ After that, get an access token.
 ```typescript
 const code = '...' // Authorization code
 
-client.fetchAccessToken(clientId, clientSecret, code)
+client.fetchAccessToken(client_id, client_secret, code)
 })
   .then((tokenData: OAuth.TokenData) => {
-    console.log(tokenData.accessToken)
-    console.log(tokenData.refreshToken)
+    console.log(tokenData.access_token)
+    console.log(tokenData.refresh_token)
   })
   .catch((err: Error) => console.error(err))
 ```