diff --git a/doc/config.html b/doc/config.html
index 8bb4f862..84087be9 100755
--- a/doc/config.html
+++ b/doc/config.html
@@ -961,6 +961,22 @@ Default is <i>"0, attribname, attribvalue, 80, 500"</i>. Trailing parameters can
 so specifying for example only the flags is possible.
 <p>
 
+<LI><b><code>Type &lt;attribute&gt; = date | numeric</b></code>
+<br>
+A normal attribute can contain strings of any type. With this option, attributes can be
+forced to be numeric or to be a date. When new logbook entries are made,
+numeric attributes are checked to contain only digits. Note that JavaScript has to be
+enabled to do this.<br><br>
+
+Attributes of type <b><code>date</code></b> are treated as a date.
+Upon entry, drop-down boxes are displayed which let the user select the day, month and
+year. Alternatively, a pop-up date picker using a calendar can be displayed if JavaScript
+is enabled. Date attributes are saved internally as seconds since 1.1.1970, and can therefore
+be sorted propoerly by clicking on the header of a logbook entry list. On the find page,
+dates can be searched for via a start and end date. If date attributes are used in a quick filter 
+(see above), a drop-down quick filter box is displayed which lets the user select "last day",
+"last week", "next week", and so on.<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