[Theme: Tonic] – How to add favicon image?

Hey,

Have tried adding favicon through functions code – but not appearing.

Need some help. Thanks!

Code used:

<?php
function blog_favicon() {
	echo '<link rel="Shortcut Icon" type="image/x-icon" href="'.get_bloginfo('stylesheet_directory').'/favicon.ico" />' . "\n";
}
add_action('wp_head', 'blog_favicon');
?>