Be sure that the id of the html tag containing the comment matches COMMENT_URL
.
COMMENT_URL = "#my_own_comment_id_{slug}"
{% for comment in article.comments recursive %}
...
<article id="my_own_comment_id_{{comment.slug}}">{{ comment.content }}</article>
...
{% endfor %}
To display a link to the article feed simply add the following to your theme:
{% if article %}
<a href="{{ FEED_DOMAIN }}/{{ PELICAN_COMMENT_SYSTEM_FEED|format(article.slug) }}">Comment Atom Feed</a>
{% endif %}