policy.xml

@@ -2787,11 +2787,15 @@ pristine-tar = True
       <sect3 id="debhelper">
         <title>Debhelper</title>
         <para>
-          Debhelper uses compatibility levels to control the behavior of its
-          commands.
+          Debhelper uses
+          <ulink url="https://manpages.debian.org/testing/debhelper/debhelper.7.en.html#COMPATIBILITY_LEVELS">compatibility levels</ulink>
+          to control the behavior of its commands.
           We currently recommend to use the level <literal>9</literal> which
-          is available in current <literal>stable</literal> (Wheezy) and
-          backported to <literal>oldstable</literal>.
+          is available in current <literal>stable</literal> (Stretch) and
+          backported to <literal>oldoldstable</literal> (Wheezy). It is also
+          the version supported in <literal>Ubuntu trusty</literal> and
+          <literal>Ubuntu xenial</literal>. If support for these is not
+          required version 10 or 11 can be used.
           However, there is no urgent need to touch packages only because it
           has an older Debhelper version.
         </para>