diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 1ce105c8f88..93c629fe51d 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -2148,7 +2148,7 @@ extern void up_ledoff(int led);
   </li>
   <li>
     <code>CONFIG_SCHED_WORKPERIOD</code>: How often the worker thread checks for
-    work.  Default: 50 MS.
+    work in units of microseconds.  Default: 50*1000 (50 MS).
   </li>
   <li>
     <code>CONFIG_SCHED_WORKSTACKSIZE</code>: The stack size allocated for the worker