netbox/netbox/templates/ui/panels/comments.html

{% extends "ui/panels/_base.html" %}
{% load i18n %}

{% block panel_content %}
  <div class="card-body">
    {% if comments %}
      {{ comments|markdown }}
    {% else %}
      <span class="text-muted">{% trans "None" %}</span>
    {% endif %}
  </div>
{% endblock panel_content %}