diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 08c6534cb4f..d8ccfc34047 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -4452,6 +4452,7 @@ build
 <ul><li>
   <code>CONFIG_MEMCPY_VIK</code>:
   Select this option to use the optimized <code>memcpy()</code> function by Daniel Vik.
+  Select this option for improved performance at the expense of increased size. 
   See licensing information in the top-level <code>COPYING</code> file.
   Default: <code>n</code>.
 </li></ul>