Add a note to the "Using Multiple Spool Mailboxes" section.
See <xref linkend="mailbox-hook"/> for more details.
</para>
+<para>
+Note that execution of mbox-hooks is dependent on the <link
+linkend="move">$move</link> configuration variable. If set to
+<quote>no</quote> (the default), mbox-hooks will not be executed.
+</para>
+
<para>
Unlike some of the other <emphasis>hook</emphasis> commands, only the
<emphasis>first</emphasis> matching regexp is used (it is not possible