Bryan Hoffman on "[Plugin: Jetpack by WordPress.com] Edit HTML output on Jetpack Comments"

Is there a filter or a hook available to edit the HTML output of the comment system title?

I'd like to add a <span> around the 'Leave a Reply' title as such:

<h3 id="reply-title" class="comment-reply-title"><span>Leave a Reply</span></h3>

See it here:
http://spigotdesign.com/2013/07/the-spigot-rorschach-test/#reply-title

http://wordpress.org/plugins/jetpack/