diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 601bb2720be..39769e60196 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -16,7 +16,7 @@
   </b></big>
   <p><small>by</small></p>
   <p>Gregory Nutt</p>
-  <p><small>Last Update: December 30, 2007</small></p>
+  <p><small>Last Update: January 6, 2006</small></p>
 </center>
 
 <center><h1>Table of Contents</h1></center>
@@ -1245,6 +1245,16 @@ The system can be re-made subsequently by just typing <code>make</code>.
     The startaddress of DRAM (virtual)</li>
 </ul>
 
+<p>
+  General build options:
+</p>
+<ul>
+  <li><code>CONFIG_RRLOAD_BINARY</code>:
+    Make the rrload binary format used with BSPs from <a href="www.ridgerun.com">ridgerun.com</a>.</li>
+  <li><code>CONFIG_HAVE_LIBM</code>:
+    Toolchain supports libm.a</li>
+</ul>
+
 <h2>General OS setup</h2>
 
 <ul>