diff --git a/auth-server-password.md b/auth-server-password.md
index 2599473d..693445b6 100755
--- a/auth-server-password.md
+++ b/auth-server-password.md
@@ -22,6 +22,8 @@ $passwordGrant = new \League\OAuth2\Server\Grant\PasswordGrant();
 $passwordGrant->setVerifyCredentialsCallback(function ($username, $password) {
     // implement logic here to validate a username and password, return an ID if valid, otherwise return false
 });
+
+$server->addGrantType($passwordGrant);
 ~~~
 
 
@@ -59,4 +61,4 @@ $router->post('/access_token', function (Request $request) use ($server) {
     }
 
 });
-~~~
\ No newline at end of file
+~~~