4 files changed, 39 insertions, 3 deletions
diff --git a/Core/Exception/CookieTheftException.php b/Core/Exception/CookieTheftException.php
index 83e61d7..09ec79e 100644
--- a/Core/Exception/CookieTheftException.php
+++ b/Core/Exception/CookieTheftException.php
@@ -19,4 +19,4 @@ namespace Symfony\Component\Security\Core\Exception;
  */
 class CookieTheftException extends AuthenticationException
 {
-}
-\ No newline at end of file
+}
diff --git a/Core/Exception/InvalidCsrfTokenException.php b/Core/Exception/InvalidCsrfTokenException.php
index f19bcbf..51adb69 100644
--- a/Core/Exception/InvalidCsrfTokenException.php
+++ b/Core/Exception/InvalidCsrfTokenException.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
 namespace Symfony\Component\Security\Core\Exception;
 
 /**
@@ -9,4 +18,4 @@ namespace Symfony\Component\Security\Core\Exception;
  */
 class InvalidCsrfTokenException extends AuthenticationException
 {
-}
-\ No newline at end of file
+}
diff --git a/Core/Exception/SessionUnavailableException.php b/Core/Exception/SessionUnavailableException.php
new file mode 100644
index 0000000..a00a503
--- /dev/null
+++ b/Core/Exception/SessionUnavailableException.php
@@ -0,0 +1,27 @@
+<?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\Exception;
+
+/**
+ * This exception is thrown when no session is available.
+ *
+ * Possible reasons for this are:
+ *
+ *     a) The session timed-out because the user waited too long.
+ *     b) The user has disabled cookies, and a new session is started on each
+ *        request.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class SessionUnavailableException extends AuthenticationException
+{
+}
diff --git a/Core/Exception/UnsupportedUserException.php b/Core/Exception/UnsupportedUserException.php
index 5be9bc4..6529fa9 100644
--- a/Core/Exception/UnsupportedUserException.php
+++ b/Core/Exception/UnsupportedUserException.php
@@ -19,4 +19,4 @@ namespace Symfony\Component\Security\Core\Exception;
  */
 class UnsupportedUserException extends AuthenticationServiceException
 {
-}
-\ No newline at end of file
+}