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diff --git a/docs/source/user/search.rst b/docs/source/user/search.rst
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@@ -22,3 +22,21 @@ xapian for details.
.. _`Query Parser`: https://getting-started-with-xapian.readthedocs.io/en/latest/concepts/search/queryparser.html
+.. _search aliases:
+
+Search templates and ``search_aliases``
+=======================================
+
+In some contexts, search queries are rendered as jinja2 templates with
+the contents of the ``search_aliases`` property as set in
+``settings.yaml``.
+
+The values of those search aliases should be valid search snippets with
+the syntax documented above; it's usually a good idea to wrap them in
+parenthesis, so that they are easier to use in complex queries; e.g.::
+
+ my_alias: '(name:object OR name:thing)'
+
+can correctly be used in a query like::
+
+ {{ my_alias }} AND description:shiny