diff --git a/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php b/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php
index b10e8d5..2f18251 100644
--- a/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php
+++ b/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php
@@ -7,6 +7,11 @@
 
 namespace Drupal\Core\Routing;
 
+/**
+ * Builds and possibly dumps the route information.
+ *
+ * @ingroup routing
+ */
 interface RouteBuilderInterface {
 
   /**