diff --git a/developer_manual/app/container.rst b/developer_manual/app/container.rst
index 25532928a..0eff3c2a6 100644
--- a/developer_manual/app/container.rst
+++ b/developer_manual/app/container.rst
@@ -103,7 +103,7 @@ To add the app's classes simply open the :file:`appinfo/application.php` use the
       /**
        * Services
        */
-      $container->registerService('AuthorMappers', function($c){
+      $container->registerService('AuthorMapper', function($c){
         return new AuthorService(
           $c->query('ServerContainer')->getDb()
         );