diff --git a/TwigExtraBundle.php b/TwigExtraBundle.php
index 5ed32a8..a9c8f73 100644
--- a/TwigExtraBundle.php
+++ b/TwigExtraBundle.php
@@ -17,6 +17,7 @@
 
 class TwigExtraBundle extends Bundle
 {
+    /** @return void */
     public function build(ContainerBuilder $container)
     {
         parent::build($container);