AUTHENTICATION.md in google-cloud-pubsub-2.7.0 vs AUTHENTICATION.md in google-cloud-pubsub-2.7.1

@@ -94,10 +94,11 @@
 client = Google::Cloud::PubSub.new
 ```
 
 ### Configuration
 
-The **Project ID** and **Credentials JSON** can be configured instead of placing them in environment variables or providing them as arguments.
+The **Project ID** and the path to the **Credentials JSON** file can be configured
+instead of placing them in environment variables or providing them as arguments.
 
 ```ruby
 require "google/cloud/pubsub"
 
 Google::Cloud::PubSub.configure do |config|