Index: head/en_US.ISO8859-1/books/handbook/cutting-edge/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/handbook/cutting-edge/chapter.xml
+++ head/en_US.ISO8859-1/books/handbook/cutting-edge/chapter.xml
@@ -297,6 +297,14 @@
 	applications should be restarted so that the patched version
 	of the binary is used.</para>
 
+      <note>
+	<para>Usually, the user needs to be prepared to reboot the
+	  system.  To know if a reboot is required by a kernel update,
+	  execute the commands <command>freebsd-version -k</command>
+	  and <command>uname -r</command> and if it differs a reboot
+	  is required.</para>
+      </note>
+
       <para>The system can be configured to automatically check for
 	updates once every day by adding this entry to
 	<filename>/etc/crontab</filename>:</para>