diff --git a/classes/Query.class.php b/classes/Query.class.php
index 59261cd4e..5a388d65b 100644
--- a/classes/Query.class.php
+++ b/classes/Query.class.php
@@ -721,7 +721,12 @@ class Doctrine_Query extends Doctrine_Access {
             $table = $this->load($reference);
         }
     }
-    
+    /**
+     * returns Doctrine::FETCH_* constant
+     *
+     * @param string $mode
+     * @return integer
+     */
     private function parseFetchMode($mode) {
         switch(strtolower($mode)):
             case "i":
diff --git a/classes/Query/Exception.class.php b/classes/Query/Exception.class.php
new file mode 100644
index 000000000..4037a8543
--- /dev/null
+++ b/classes/Query/Exception.class.php
@@ -0,0 +1,5 @@
+<?php
+require_once(Doctrine::getPath().DIRECTORY_SEPARATOR."Exception.class.php");
+
+class Doctrine_Query_Exception extends Doctrine_Exception { }
+?>
diff --git a/classes/Session/Exception.class.php b/classes/Session/Exception.class.php
new file mode 100644
index 000000000..6a912e4ea
--- /dev/null
+++ b/classes/Session/Exception.class.php
@@ -0,0 +1,13 @@
+<?php
+require_once(Doctrine::getPath().DIRECTORY_SEPARATOR."Exception.class.php");
+/**
+ * thrown when user tries to get the current 
+ * session and there are no open sessions
+ */
+class Doctrine_Session_Exception extends Doctrine_Exception {
+    public function __construct() {
+        parent::__construct("There are no opened sessions. Use 
+                             Doctrine_Manager::getInstance()->openSession() to open a new session.",Doctrine::ERR_NO_SESSIONS);
+    }
+}
+?>