diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index f685d92abcf..ddd2086bf0a 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -2380,9 +2380,6 @@ else
     Set the RTC to the provided time.
     All RTC implementations must be able to set their time based on a standard timespec.
   </li>
-  <li><code>up_rtc_setalarm()</code>.
-    Set up an alarm.
-  </li>
 </ul>
 
 <h3><a name="systcktime">4.3.3 System Tick and Time</a></h3>