diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index c3093d8b783..1ce105c8f88 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: November 5, 2009</p>
+      <p>Last Updated: November 17, 2009</p>
     </td>
   </tr>
 </table>
@@ -2288,6 +2288,25 @@ extern void up_ledoff(int led);
   </li>
 </ul>
 
+<h2>SDIO-based MMC/SD driver</h2>
+<ul>
+  <li>
+    <code>CONFIG_FS_READAHEAD</code>: Enable read-ahead buffering
+  </li>
+  <li>
+    <code>CONFIG_FS_WRITEBUFFER</code>: Enable write buffering
+  </li>
+  <li>
+    <code>CONFIG_SDIO_DMA</code>: SDIO driver supports DMA
+  </li>
+  <li>
+    <code>CONFIG_MMCSD_MMCSUPPORT</code>: Enable support for MMC cards
+  </li>
+  <li>
+    <code>CONFIG_MMCSD_HAVECARDDETECT</code>: SDIO driver card detection is 100% accurate
+  </li>
+</ul>
+
 <h2>Network Support</h2>
 <h3>TCP/IP and UDP support via uIP</h2>
 <ul>