{% extends 'admin/object_history.html' %}{% comment %} This file is selected by default to display polymorphic mptt object history. When using reversion or reversion-compare, this template could be replaced with the proper {% extends "reversion/object_history.html" %} template. Hence, the breadcrumb code is in a separate include file. {% endcomment %} {% block breadcrumbs %}{% include "admin/polymorphic_tree/object_history_breadcrumbs.html" %}{% endblock %}