wordpress, using rss title filte

<?php
/*
Plugin Name: Modify Title
Plugin URI: http://wordpress.org
Description: Modify RSS title
Author: WP
Version: 1.0
Author URI: http://www.wordpress.org
*/

// --------------------------------------------
// FILTER TITLE of RSS USING BLOGINFO FILTER
// --------------------------------------------
//

function gv_modify_rss_title($show) {
        // seems to run through this filter for each element of the bloginfo 
	// $show is the value of this particular bloginfo call
        // check to see if it's same as nornal bloginfo('name')
        // if it is (i.e. that we're processing the title) modify $show and return
        // the new value. 

	if ($show == get_bloginfo('name')){
		$show = "Test ". $show;
	}
	return $show;	
}
add_filter('bloginfo_rss', 'gv_modify_rss_title');

?>