diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index e02e85cc502..de02f251984 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -12,7 +12,7 @@
       <h1><big><font color="#3c34ec">
         <i>NuttX RTOS Porting Guide</i>
       </font></big></h1>
-      <p>Last Updated: September 4, 2011</p>
+      <p>Last Updated: September 13, 2011</p>
     </td>
   </tr>
 </table>
@@ -4744,7 +4744,7 @@ build
   </li>
 </ul>
 
-<h3>USB Serial Device Class Driver</h3>
+<h3>USB Serial Device Class Driver (Prolific PL2303 Emulation)</h3> 
 <ul>
   <li>
     <code>CONFIG_USBSER</code>: Enable compilation of the USB serial driver
@@ -4772,6 +4772,57 @@ build
   </li>
 </ul>
 
+<h3>USB serial device class driver (Standard CDC ACM class)</h3>
+<ul>
+  <li>
+    <code>CONFIG_CDCSER</code>:  Enable compilation of the USB serial driver
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EP0MAXPACKET</code>:  Endpoint 0 max packet size. Default 8.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPINTIN</code>:  The logical 7-bit address of a hardware endpoint that supports
+  interrupt IN operation.  Default 2.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPINTIN_FSSIZE</code>:  Max package size for the interrupt IN endpoint if full speed mode. Default 64.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPINTIN_HSSIZE</code>:  Max package size for the interrupt IN endpoint if high speed mode. Default 512.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPBULKOUT</code>:  The logical 7-bit address of a hardware endpoint that supports
+  bulk OUT operation.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPBULKOUT_FSSIZE</code>:  Max package size for the bulk OUT endpoint if full speed mode.  Default 64.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPBULKOUT_HSSIZE</code>:  Max package size for the bulk OUT  endpoint if high speed mode.  Default 512.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPBULKIN</code>:  The logical 7-bit address of a hardware endpoint that supports
+  bulk IN operation
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPBULKIN_FSSIZE</code>:  Max package size for the bulk IN endpoint if full speed mode.  Default 64.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_EPBULKIN_HSSIZE</code>:  Max package size for the bulk IN  endpoint if high speed mode.  Default 512.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_NWRREQS</code> and <code>CONFIG_CDCSER_NRDREQS</code>:  The number of write/read requests that can be in flight.  Default 4.
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_VENDORID</code> and <code>CONFIG_CDCSER_VENDORSTR</code>:  The vendor ID code/string.  Default 0x03eb and &quot;NuttX&quot;
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_PRODUCTID</code> and <code>CONFIG_CDCSER_PRODUCTSTR</code>:  The product ID code/string. Default 0x204b and &quot;CDC/ACM Serial&quot;
+  </li>
+  <li>
+    <code>CONFIG_CDCSER_RXBUFSIZE</code> and <code>CONFIG_CDCSER_TXBUFSIZE</code>:  Size of the serial receive/transmit buffers.  Default 256.
+</ul>
+
 <h3>USB Storage Device Configuration</h3>
 <ul>
   <li>