Trying to add an item in the RSS-feed, post ID problems

  • Hi,

    I’m trying to add an extra item to the RSS-field, since I would like my Thumbnails (placed in extra fields) to be in it.

    I’m using this code, yet it doesn’t seem to work and I have no idea why:

    function thumb_rss() {
    	$thumbnail = get_post_meta(get_the_ID(), 'Thumbnail', true);
        ?>
        <thumbnail><img src="<?php echo $thumbnail; ?>" /></thumbnail>
        <?php
}
add_action('rss2_item', 'thumb_rss');

    What is it that i’m doing wrong?

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