diff --git a/Writer.php b/Writer.php
index 4619f8b..3567119 100644
--- a/Writer.php
+++ b/Writer.php
@@ -58,6 +58,7 @@ class Spreadsheet_Excel_Writer extends Workbook
     /**
     * Send HTTP headers for the Excel file.
     *
+    * @param string $filename The filename to use for HTTP headers
     * @access public
     */
     function send($filename)
diff --git a/Writer/Format.php b/Writer/Format.php
index 66c93ec..a7612a9 100644
--- a/Writer/Format.php
+++ b/Writer/Format.php
@@ -79,7 +79,7 @@ class Format extends PEAR
 
     /**
     * Index to the cell's color
-    * @var 
+    * @var integer
     */
     var $_color;
 
diff --git a/Writer/Workbook.php b/Writer/Workbook.php
index 19cde45..08af9de 100644
--- a/Writer/Workbook.php
+++ b/Writer/Workbook.php
@@ -55,7 +55,7 @@ class Workbook extends BIFFwriter
 
     /**
     * Formula parser
-    * @var object
+    * @var object Parser
     */
     var $_parser;
 
@@ -111,7 +111,7 @@ class Workbook extends BIFFwriter
 
     /**
     * The default XF format.
-    * @var object
+    * @var object Format
     */
     var $_tmp_format;
 
@@ -141,7 +141,7 @@ class Workbook extends BIFFwriter
 
     /**
     * The default format for URLs.
-    * @var object
+    * @var object Format
     */
     var $_url_format;
 
diff --git a/Writer/Worksheet.php b/Writer/Worksheet.php
index 51836fb..f958b41 100644
--- a/Writer/Worksheet.php
+++ b/Writer/Worksheet.php
@@ -58,13 +58,13 @@ class Worksheet extends BIFFwriter
 
     /**
     * Reference to the (default) Format object for URLs
-    * @var object
+    * @var object Format
     */
     var $_url_format;
 
     /**
     * Reference to the parser used for parsing formulas
-    * @var object
+    * @var object Format
     */
     var $_parser;
 
@@ -916,7 +916,7 @@ class Worksheet extends BIFFwriter
     *
     * @access public
     * @param  integer $width  Maximun width of printed area in pages
-    * @param  integer $heigth Maximun heigth of printed area in pages
+    * @param  integer $height Maximun heigth of printed area in pages
     * @see setPrintScale()
     */
     function fitToPages($width, $height)
@@ -1050,7 +1050,7 @@ class Worksheet extends BIFFwriter
     /**
     * Returns an index to the XF record in the workbook
     *
-    * @param mixed $format The optional XF format
+    * @param mixed &$format The optional XF format
     * @return integer The XF record index
     */
     function _XF(&$format)