diff --git a/lam/docs/manual-sources/howto.xml b/lam/docs/manual-sources/howto.xml
index 5e2ab890..eebd2515 100644
--- a/lam/docs/manual-sources/howto.xml
+++ b/lam/docs/manual-sources/howto.xml
@@ -4626,6 +4626,9 @@ mysql> GRANT ALL PRIVILEGES ON lam_cron.* TO 'lam_cron'@'localhost';
         setup some common environment names. LAM will use them to provide
         autocompletion hints when editing the environment for a node.</para>
 
+        <para>If you enter any value in "Enforce classes" then LAM will only
+        accept this list of classes.</para>
+
         <screenshot>
           <mediaobject>
             <imageobject>
diff --git a/lam/docs/manual-sources/images/mod_puppet1.png b/lam/docs/manual-sources/images/mod_puppet1.png
index a1415990..8597b35f 100644
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diff --git a/lam/docs/manual-sources/images/mod_puppet3.png b/lam/docs/manual-sources/images/mod_puppet3.png
index 5176d07c..532f2ebc 100644
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