diff --git a/Writer.php b/Writer.php
index 1204bdf..36480ab 100644
--- a/Writer.php
+++ b/Writer.php
@@ -48,7 +48,7 @@ class Spreadsheet_Excel_Writer extends Workbook
     * The constructor. It just creates a Workbook
     *
     * @param string $filename The optional filename for the Workbook.
-    * @return object The Workbook created
+    * @return Workbook The Workbook created
     */
     function Spreadsheet_Excel_Writer($filename = '')
     {
diff --git a/Writer/Workbook.php b/Writer/Workbook.php
index e663be7..0d6745e 100644
--- a/Writer/Workbook.php
+++ b/Writer/Workbook.php
@@ -224,7 +224,7 @@ class Workbook extends BIFFwriter
     *
     * @access public
     * @param string $name the optional name of the worksheet
-    * @return &object reference to a worksheet object
+    * @return &Worksheet reference to a worksheet object
     */
     function &addWorksheet($name = '')
     {
@@ -264,7 +264,7 @@ class Workbook extends BIFFwriter
     *
     * @access public
     * @param array $properties array with properties for initializing the format (see Format.php)
-    * @return &object reference to an XF format
+    * @return &Format reference to an XF format
     */
     function &addFormat($properties = array())
     {