diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index b401adcdbe..de45bf743d 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -117,7 +117,8 @@
        <a href="#i2cdrivers">6.3.3 I2C Device Drivers</a><br>
        <a href="#serialdrivers">6.3.4 Serial Device Drivers</a><br>
        <a href="#fbdrivers">6.3.5 Frame Buffer Drivers</a><br>
-       <a href="#mtddrivers">6.3.6 Memory Technology Device Drivers</a>
+       <a href="#mtddrivers">6.3.6 Memory Technology Device Drivers</a><br>
+       <a href="#sdiodrivers">6.3.7 SDIO Device Drivers</a><br>
     </ul>
   </ul>
   <a href="#apndxconfigs">Appendix A: NuttX Configuration Settings</a><br>