diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 4ded08f0fbc..15019ad102d 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -4730,6 +4730,15 @@ build
     <code>CONFIG_STMPE11_REGDEBUG</code>:
       Enabled very low register-level debug output.  Requires <code>CONFIG_DEBUG</code>.
   </li>
+  <li>
+    <code>CONFIG_STMPE11_THRESHX</code> and <code>CONFIG_STMPE11_THRESHY</code>:
+    STMPE11 touchscreen data comes in a a very high rate.  New touch positions
+    will only be reported when the X or Y data changes by these thresholds.
+    This trades reduces data rate for some loss in dragging accuracy.  The
+    STMPE11 is configure for 12-bit values so the raw ranges are 0-4095. So
+    for example, if your display is 320x240, then THRESHX=13 and THRESHY=17
+    would correspond to one pixel.  Default: 12
+  </li>
 </ul>
 
 <h3>Analog Devices</h3>