diff --git a/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php b/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php
index 83b1d3e..49302f1 100644
--- a/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php
+++ b/core/lib/Drupal/Core/Routing/RouteBuilderInterface.php
@@ -2,10 +2,27 @@
 
 namespace Drupal\Core\Routing;
 
+/**
+ * Rebuilds the route information and dumps it.
+ *
+ * Rebuilding the route information is the process of gathering all routing data
+ * from .routing.yml files, creating a
+ * \Symfony\Component\Routing\RouteCollection object out of it, and dispatching
+ * that object as a \Drupal\Core\Routing\RouteBuildEvent to all registered
+ * listeners. After that, the \Symfony\Component\Routing\RouteCollection object
+ * is used to dump the data. Examples of a dump include filling up the routing
+ * table, auto-generating Apache mod_rewrite rules, or auto-generating a PHP
+ * matcher class.
+ *
+ * @see \Drupal\Core\Routing\MatcherDumperInterface
+ * @see \Drupal\Core\Routing\RouteProviderInterface
+ *
+ * @ingroup routing
+ */
 interface RouteBuilderInterface {
 
   /**
-   * Rebuilds the route info and dumps to dumper.
+   * Rebuilds the route information and dumps it.
    *
    * @return bool
    *   Returns TRUE if the rebuild succeeds, FALSE otherwise.
@@ -13,7 +30,7 @@
   public function rebuild();
 
   /**
-   * Rebuilds the route info and dumps to dumper if necessary.
+   * Rebuilds the route information and dumps it, but only if necessary.
    *
    * @return bool
    *   Returns TRUE if the rebuild occurs, FALSE otherwise.