app/concepts/discussion/views/comment_form.erb
<div class="discussion-comment" data-cell='Discussion::Cell::CommentForm'>
<div class="pic">
<%= link_to participant_path(current_participant) do %>
<%= concept(Image::Cell,current_participant) %>
<% end %>
</div>
<%= form_for topic_comments_path(topic, comment) do |f| %>
<%= f.text_area :comment_markdown, placeholder: "Add a comment...", autofocus: true %>
<p class='markdown-instructions'>You can use
<a href="https://kramdown.gettalong.org/">kramdown</a> in this field.
</p>
<% end %>
</div>