diff --git a/doc/config.html b/doc/config.html
index 14f07517..20836f07 100755
--- a/doc/config.html
+++ b/doc/config.html
@@ -768,6 +768,13 @@ Optional comment which is displayed below the attribute name in the entry form.
 Can be used to explain the attribute somehow.
 <p>
 
+<LI><b><code>Tooltip &lt;attribute&gt; = &lt;comment&gt;</code></b>
+<br>
+Same as <code><b>Comment &lt;attribute&gt;</b></code>, except that the comment
+gets displayed as a tooltip (tiny pup-up window) when the user moves the mouse
+cursor over the attribute name in the entry form.
+<p>
+
 <LI><b><code>Icon comment &lt;icon&gt; = &lt;comment&gt;</code></b>
 <br>
 Icons may contain a comment, which is then used in email notifications instead