--- a/master.idx	Fri Sep 28 14:47:26 2007 -0500
+++ b/master.idx	Fri Sep 28 17:57:21 2007 -0500
@@ -188,6 +188,18 @@
           </span>
           <span id="rootfs">
           </span>
+          <span id="devfs (obsolete)">
+<p>Devfs was the first attempt to do a dynamic /dev directory which could change
+in response to hotpluggable hardware, by doing the seemingly obvious thing of
+creating a kernel filesystem to mount on /dev which would adjust itself as
+the kernel detected changes in the available hardware.</p>
+
+<p>Devfs was an interesting learning experience, but turned out to be the wrong
+approach, and was replaced by sysfs and udev.  Devfs was removed in kernel
+version 2.6.18.  See
+<a href=local/hotplug-history.html>the history of hotplug</a> for details.</p>
+
+          </span>
         </span>
         <span id="Network">
           <span id="nfs">