Index: en_US.ISO8859-1/books/porters-handbook/testing/chapter.xml
===================================================================
--- en_US.ISO8859-1/books/porters-handbook/testing/chapter.xml
+++ en_US.ISO8859-1/books/porters-handbook/testing/chapter.xml
@@ -457,6 +457,25 @@
 	  enough.</para>
       </note>
 
+      <note>
+	<para>To create a <application>Poudriere</application> jail
+	  for <literal>12.0-CURRENT</literal>:</para>
+
+	    <screen>&prompt.root; <userinput>poudriere jail -c -j 12amd64 -v head -a amd64 -m svn+https</userinput></screen>
+
+	  <para>In order to run a <literal>12.0-CURRENT</literal>
+	    <application>Poudriere</application> jail you must be
+	    running <literal>12.0-CURRENT</literal>.  In general newer
+	    kernels can build and run older jails.  For instance, a
+	    <literal>12.0-CURRENT</literal> kernel can build and run a
+	    <literal>11.1-STABLE</literal>
+	    <application>Poudriere</application> jails if the
+	    <literal>COMPAT_FREEBSD11</literal> kernel option was
+	    compiled in (on by default in
+	    <literal>12.0-CURRENT</literal>
+	    <filename>GENERIC</filename> kernel config.</para>
+	</note>
+
       <caution>
 	<para>The default <literal>svn</literal> protocol works but is
 	  not very secure.  Using <literal>svn+https</literal> along