diff --git a/calendar/quickstart/README.md b/calendar/quickstart/README.md
index fc5b71d..8f620f5 100644
--- a/calendar/quickstart/README.md
+++ b/calendar/quickstart/README.md
@@ -14,9 +14,9 @@ composer install
 
 ### Download Developer Credentials
 
-- Follow the steps in the quickstart instructions to download your developer
+- Follow [the steps in the quickstart instructions](https://github.com/googleapis/google-api-php-client/blob/master/docs/oauth-web.md#create-authorization-credentials) to download your developer
   credentials and save them in a file called `credentails.json` in this
-  directory.
+  directory. Please make sure you are using "Desktop" application type.
 
 ## Run