diff --git a/lib/Doctrine/Transaction.php b/lib/Doctrine/Transaction.php
index 50b6cc0c5..c1225a80e 100644
--- a/lib/Doctrine/Transaction.php
+++ b/lib/Doctrine/Transaction.php
@@ -20,6 +20,8 @@
  */
 Doctrine::autoload('Doctrine_Connection_Module');
 /**
+ * Doctrine_Transaction
+ * Handles transaction savepoint and isolation abstraction
  *
  * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
  * @author      Lukas Smith <smith@pooteeweet.org> (PEAR MDB2 library)