diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index e43ca8a2fa..08c6534cb4 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -4457,7 +4457,7 @@ build
 </li></ul>
 
 <p>
-  And if <code>CONFIG_MEMCPY_VIK</code>, the following tuning options are available:
+  And if <code>CONFIG_MEMCPY_VIK</code> is selected, the following tuning options are available:
 </p>
 <ul><li>
     <code>CONFIG_MEMCPY_PRE_INC_PTRS</code>:
@@ -4471,7 +4471,7 @@ build
 </li>
 <li>
     <code>CONFIG_MEMCPY_64BIT</code>:
-    Compiles memcpy for 64 bit architectures
+    Compiles <code>memcpy()</code> for 64 bit architectures
 </li></ul>
 
 <p><li>
@@ -4483,6 +4483,14 @@ build
   Default: <code>memset()</code> is optimized for size.
 </li></ul>
 
+<p>
+  And if <code>CONFIG_MEMSET_OPTSPEED</code> is selected, the following tuning option is available:
+</p>
+<ul><li>
+  <code>CONFIG_MEMSET_64BIT</code>:
+  Compiles <code>memset()</code> for 64 bit architectures
+</li></ul>
+
 <li>
   <p>
     The architecture may provide custom versions of certain standard header files: