diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index a471ac72a7c..dfee322125d 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -1761,7 +1761,7 @@ The system can be re-made subsequently by just typing <code>make</code>.
     <code>CONFIG_STACK_POINTER</code>: The initial stack pointer
   </li>
   <li>
-    <code>CONFIG_PROC_STACK_SIZE</code>: The size of the initial stack
+    <code>CONFIG_IDLETHREAD_STACKSIZE</code>: The size of the initial stack
   </li>
   <li>
     <code>CONFIG_PTHREAD_STACK_MIN</code>: Minimum pthread stack size