diff --git a/doc/config.html b/doc/config.html
index c05b0ff2..4707a182 100755
--- a/doc/config.html
+++ b/doc/config.html
@@ -741,6 +741,12 @@ supplied in an author attribute via the <i>"Preset xxxx"</i> option.
 The default is <b>0</b>.
 <p>
 
+<li><b><code>Top level only = 0/1</code></b>
+</br>
+If this flag is <b>1</b>, only top level messages are displayed in the search
+result page for threaded display. No replies are shown. The default is <b>0</b>.
+<p>
+
 </ul><p>
 
 <a name="themes"><hr>