diff --git a/README.md b/README.md
index d0679432a..ec8b69c79 100644
--- a/README.md
+++ b/README.md
@@ -240,6 +240,18 @@ result = translate.list_translations('Hello world!', 'es', source: 'en')
 puts result.translations.first.translated_text
 ```
 
+### Authorization using environment variables
+
+The [GoogleAuth Library for Ruby](https://github.com/google/google-auth-library-ruby) also supports authorization via
+environment variables if you do not want to check in developer credentials
+or private keys. Simply set the following variables for your application:
+
+```sh
+GOOGLE_ACCOUNT_TYPE="YOUR ACCOUNT TYPE" # ie. 'service'
+GOOGLE_CLIENT_EMAIL="YOUR GOOGLE DEVELOPER EMAIL"
+GOOGLE_PRIVATE_KEY="YOUR GOOGLE DEVELOPER API KEY"
+```
+
 ## Samples
 
 Samples for versions 0.9 and onward can be found in the `samples` directory.