diff --git a/service_container.rst b/service_container.rst
index ddb81243ccd..b976736f9d6 100644
--- a/service_container.rst
+++ b/service_container.rst
@@ -352,7 +352,7 @@ you can type-hint the new ``SiteUpdateManager`` class and use it::
 
     class SiteController extends AbstractController
     {
-        public function new(SiteUpdateManager $siteUpdateManager)
+        public function new(SiteUpdateManager $siteUpdateManager): Response
         {
             // ...