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diff --git a/Core/Role/RoleHierarchyInterface.php b/Core/Role/RoleHierarchyInterface.php
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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Security\Core\Role;
+
+/**
+ * RoleHierarchyInterface is the interface for a role hierarchy.
+ *
+ * @author Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+interface RoleHierarchyInterface
+{
+    /**
+     * Returns an array of all reachable roles.
+     *
+     * Reachable roles are the roles directly assigned but also all roles that
+     * are transitively reachable from them in the role hierarchy.
+     *
+     * @param array $roles An array of directly assigned roles
+     *
+     * @return array An array of all reachable roles
+     */
+    function getReachableRoles(array $roles);
+}