document default sets

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diff --git a/doc/config/sets.docbook b/doc/config/sets.docbook
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@@ -446,4 +446,26 @@
                        </sect3>
                </sect2>
        </sect1>
+       
+       <sect1 id='config-set-defaults'>
+       <title>Default Sets</title>
+       <para>
+       By default, Portage already creates a few default sets that can be used 
+       without further configuration. See <xref linkend='config-set-locations'/>
+       and <xref linkend='config-set-syntax'/> for details on how to change those
+       defaults.
+       </para>
+       <para>
+       The default sets are:
+       <itemizedlist>
+       <listitem><varname>system</varname>: uses <classname>PackagesSystemSet</classname></listitem>
+       <listitem><varname>world</varname>: uses <classname>WorldSet</classname></listitem>
+       <listitem><varname>security</varname>: uses <classname>NewAffectedSet</classname> with default options</listitem>
+       <listitem><varname>everything</varname>: uses <classname>EverythingSet</classname></listitem>
+       </itemizedlist>
+       Additionally the default configuration includes a multi set section based on
+       the <classname>StaticFileSet</classname> defaults that creates a set for each 
+       file in <filename>/etc/portage/sets</filename> for convenience.
+       </para>
+       </sect1>
 </chapter>