Index: wp-admin/export.php
===================================================================
--- wp-admin/export.php	(revision 14794)
+++ wp-admin/export.php	(working copy)
@@ -65,6 +65,7 @@
 <p><?php _e('Once you&#8217;ve saved the download file, you can use the Import function on another WordPress site to import this site.'); ?></p>
 <form action="" method="get">
 <h3><?php _e('Filters'); ?></h3>
+<p><?php _e('If you want to export only some parts, you can use the filters below. The default is to export everything.'); ?></p>
 
 <table class="form-table">
 <tr>