diff --git a/doc/windivert.html b/doc/windivert.html
index bbc1ced..344ca40 100644
--- a/doc/windivert.html
+++ b/doc/windivert.html
@@ -511,6 +511,18 @@ drivers.</li>
 </ol>
 </td>
 </tr>
+<tr>
+<td>
+<tt>EPT_S_NOT_REGISTERED</tt>
+</td>
+<td>
+1753
+</td>
+<td>
+This error occurs when the <i>Base Filtering Engine</i> service has been
+disabled.
+</td>
+</tr>
 </table>
 </center>
 </p><p>