diff --git a/Contrib/InstallOptions/Readme.html b/Contrib/InstallOptions/Readme.html
index 90f8af37..801ce687 100644
--- a/Contrib/InstallOptions/Readme.html
+++ b/Contrib/InstallOptions/Readme.html
@@ -390,6 +390,9 @@ numbers from 1 to NumFields. Each Field section can contain the following values
             <td class="righttable">GROUP</td>
             <td class="righttable">Always add this flag to the first control in a group
             of "<span class="italic">RadioButton</span>" controls.</td></tr>
+          <tr>
+            <td class="righttable">DISABLED</td>
+            <td class="righttable">Causes a control to be disabled.</tr>
         </table></td></tr></table>
 <p class="header">How to use</p>
 <p class="subheader">Modern UI</p>