diff --git a/Documentation/NuttX.html b/Documentation/NuttX.html
index 364995290a..7c07a0f3fb 100644
--- a/Documentation/NuttX.html
+++ b/Documentation/NuttX.html
@@ -514,6 +514,13 @@
       <li><a href="NuttxPortingGuide.html#pwrmgmt">Power management</a> sub-system.</li>
     </p>
 </tr>
+<tr>
+  <td><br></td>
+  <td>
+    <p>
+      <li>ModBus support provided by built-in <a href="http://freemodbus.berlios.de/">FreeModBus</a> version 1.5.0.</li>
+    </p>
+</tr>
 
 <tr>
   <td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>