diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 06f2c3e6ff9..875b78e619c 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -4578,9 +4578,6 @@ build
   <li>
     <code>CONFIG_FS_FAT</code>: Enable FAT file system support.
   </li>
-  <li>
-    <code>CONFIG_FAT_SECTORSIZE</code>: Max supported sector size.
-  </li>
   <li>
     <code>CONFIG_FAT_LCNAMES</code>: Enable use of the NT-style upper/lower case 8.3 file name support.
   </li>