diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 4b562057dea..62f795887f2 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -3729,6 +3729,9 @@ build
     If only <code>CONFIG_DEBUG</code> then the only output will be errors, warnings, and critical information.
     If <code>CONFIG_DEBUG_VERBOSE</code> is defined in addition, then general debug comments will also be included in the console output.
   </li>
+  <li>
+    <code>CONFIG_DEBUG_ENABLE</code>: Support an interface to enable or disable debug output.
+  </li>
   <li>
     <code>CONFIG_DEBUG_SYMBOLS</code>: build without optimization and with debug symbols (needed for use with a debugger).
     This option has nothing to do with debug output.