--- a/ckanext/datagovau/templates/package/snippets/package_metadata_fields.html
+++ b/ckanext/datagovau/templates/package/snippets/package_metadata_fields.html
@@ -1,1 +1,18 @@
+{% ckan_extends %}
 
+{# Remove 'free extras' from the package form. If you're using
+convert_to/from_extras() as we are with our 'custom_text' field below then
+you need to remove free extras from the form, or editing your custom field
+won't work. #}
+{% block custom_fields %}
+{% endblock %}
+
+{# https://github.com/okfn/ckan/blob/master/ckan/templates/macros/form.html documents the macros for fields #}
+
+{% block package_metadata_fields %}
+
+
+{{ super() }}
+
+{% endblock %}
+