How to add information on the top of Widgets admin page?

I didn’t really know why someone would need to use this action hook until I came across to the development of my pnewest plugin: Custom Dynamic Sidebars. I will provide the download link soon. Nevertheless, this is the piece of code you need:

add_action( 'widgets_admin_page', 'widgets_admin_info' );
function widgets_admin_info() {
    ?>
    <p style="clear:both;">You can customize your blog using widget!</p>
    <!--?<span class="hiddenSpellError" pre=""-->php
}

Have a nice weekend!