diff --git a/examples/PublicOAuthAuthentication.md b/examples/PublicOAuthAuthentication.md
index 1b8b0dad9..6d5efd793 100644
--- a/examples/PublicOAuthAuthentication.md
+++ b/examples/PublicOAuthAuthentication.md
@@ -7,6 +7,12 @@ using Twilio.Rest.Api.V2010.Account;
 //Message sid in this example is the sid of any previously sent message
 class Program
 {
+    private static final String GRANT_TYPE = "client_credentials";
+    private static final String CLIENT_ID = System.getenv("OAUTH_CLIENT_ID");
+    private static final String CLIENT_SECRET = System.getenv("OAUTH_CLIENT_SECRET");
+    private static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
+    private static final String MESSAGE_SID = System.getenv("MESSAGE_SID");
+    
     static void Main(string[] args)
     {
         CredentialProvider credentialProvider = new ClientCredentialProvider(CLIENT_ID, CLIENT_SECRET);