overriding Django change_list_results

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I am customizing my admin panel a little and want to add an additional column to it, so as per the docs I have to override the change_form_results.html file but how do I do it? all I see is this code in it

{% for result in results %}
{% if result.form and result.form.non_field_errors %}
    <tr><td colspan="{{ result|length }}">{{ result.form.non_field_errors }}</td> </tr>
{% endif %}
<tr>{% for item in result %}
  {{ item }}
  {% endfor %}</tr>
{% endfor %}


what change am i suppose to make to above code

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