Can't Change Read More Link in Child Theme?

I am trying to modify the excerpt read more bit in a child theme. I put this in the functions.php:

// Replaces the excerpt "more" text by a link
	function new_excerpt_more($more) {
	       global $post;
		return '<a class="moretag" href="'. get_permalink($post->ID) . '"> Read the full article...</a>';
	}
	add_filter('excerpt_more', 'new_excerpt_more');

I looked in my parent theme (Reverie) to see if it had any filters for this already, but I didn’t see any. What am I doing wrong?