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diff --git a/Core/User/EquatableInterface.php b/Core/User/EquatableInterface.php
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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.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\User;
+
+/**
+ * EquatableInterface used to test if two objects are equal in security
+ * and re-authentication context.
+ *
+ * @author Dariusz Górecki <darek.krk@gmail.com>
+ */
+interface EquatableInterface
+{
+    /**
+     * The equality comparison should neither be done by referential equality
+     * nor by comparing identities (i.e. getId() === getId()).
+     *
+     * However, you do not need to compare every attribute, but only those that
+     * are relevant for assessing whether re-authentication is required.
+     *
+     * Also implementation should consider that $user instance may implement
+     * the extended user interface `AdvancedUserInterface`.
+     *
+     * @param UserInterface $user
+     *
+     * @return Boolean
+     */
+    function isEqualTo(UserInterface $user);
+}