diff --git a/doc/config.html b/doc/config.html
index 21225042..8882ee06 100755
--- a/doc/config.html
+++ b/doc/config.html
@@ -737,6 +737,13 @@ subject with a "Re: &lt;old subject&gt;":<br>
 <pre>Subst on reply subject = Re: $subject</pre>
 <p>
 
+<LI><b><code>Subst on edit &lt;attribute &gt; = &lt;string&gt;</code></b>
+<br>
+Substitution of attributes for edited messages. This option can be used to replace the 
+author by the current author for example:<br>
+<pre>Subst on edit author = $full_name</pre>
+<p>
+
 <LI><b><code>Quick filter = &lt;list&gt;</code></b>
 <br>
 Specifies list of comma separated attributes for which a drop-down filter is displayed