diff --git a/doc/config.html b/doc/config.html
index 2651e933..9499583c 100755
--- a/doc/config.html
+++ b/doc/config.html
@@ -339,12 +339,25 @@ if several logbooks use the same images and icons, but differnt colors. By defau
 the CSS <i>default.css</i> is used. This can be overwritten by this statement.
 <p>
 
+<LI><b><code>Title image = &lt;string&gt;</code></b>
+<br>
+HTML code for the icon in the upper right corner. By default, following code
+is used:<p>
+
+&lt;img border=0 src="elog.gif" alt="ELOG logo"&gt;<p>
+
+This code can be replaced by <b><code>&lt;string&gt;</code></b> to display a different
+icon file, or to display some text. The icon image has to be present in the theme directory,
+which is usually <b><code>&lt;elog root&gt;/themes/default</code></b>.
+<p>
+
 <LI><b><code>Title image URL = &lt;URL&gt;</code></b>
 <br>
 The ELOG icon at the right upper corner usually points to the ELOG home page. This
 URL can be changed to point to a corporate page for example with this option. The
 icon can be changed by replacing the <b><code>elog.gif</code></b> icon in the
-theme directory.
+theme directory. This option should only be used if the <b><code>Title image</code></b>
+option is not used.
 <p>
 
 <LI><b><code>Date format = &lt;string&gt;</code></b>
@@ -855,6 +868,28 @@ Values used for new message entry form:
 
 Default is <i>"0, attribname, attribvalue, 80, 500"</i>. Trailing parameters can be ommitted,
 so specifying for example only the flags is possible.
+<p>
+
+<LI><b><code>Execute new | edit | delete = &lt;command&gt;</b></code>
+<br>
+It is possible to execute a shell command on the server side after a new message
+has been submitted, edited or deleted. This feature has been used in the past
+for SMS notifications over a telephone system and for synchrnonization of the ELOG
+database with an external SQL database. The <b><code>&lt;command&gt;</code></b> can
+contain substitutions similar to the <b><code>Subst</code></b> command.
+Following (Unix) command writes a notification into some file:<p>
+
+<pre>
+Execute new = echo "New message of type $type from $long_name on $remote_host" >> /tmp/elog.log
+</pre>
+<br>
+It should be noted that this feature can impose a security problem. If someone can edit
+the elogd.cfg through the <b><code>Config</code></b> command of elogd, that person
+can put malicious code into elogd.cfg and execute it. This is even more severe if elogd
+runs with root privileges. To avoid such problems, the execute facility is disabled
+in elogd by default and has to be enabled explicitly with the "-x" command line flag.
+The administrator has to ensure then of course that only trusted people can edit elogd.cfg.
+<p>
 
 </UL>