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diff --git a/Csrf/TokenGenerator/TokenGeneratorInterface.php b/Csrf/TokenGenerator/TokenGeneratorInterface.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\Csrf\TokenGenerator;
+
+/**
+ * Generates and validates CSRF tokens.
+ *
+ * You can generate a CSRF token by using the method {@link generateCsrfToken()}.
+ * This method expects a unique token ID as argument. The token ID can later be
+ * used to validate a token provided by the user.
+ *
+ * Token IDs do not necessarily have to be secret, but they should NEVER be
+ * created from data provided by the client. A good practice is to hard-code the
+ * token IDs for the various CSRF tokens used by your application.
+ *
+ * You should use the method {@link isCsrfTokenValid()} to check a CSRF token
+ * submitted by the client. This method will return true if the CSRF token is
+ * valid.
+ *
+ * @since  2.4
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface TokenGeneratorInterface
+{
+    /**
+     * Generates a CSRF token.
+     *
+     * @return string The generated CSRF token
+     */
+    public function generateToken();
+}