diff --git a/docs/changelog.rst b/docs/changelog.rst
index e0b88820..d9f48ecf 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -4,13 +4,20 @@
 Changelog
 =========
 
-.. _v0_45a2:
+.. _v0_45a3:
 
-0.45a2 (2020-06-23)
+0.45a3 (2020-06-27)
 -------------------
 
 .. warning:: This is an **alpha** release. See :ref:`contributing_alpha_beta`.
 
+- Canned queries now support :ref:`canned_queries_magic_parameters`, which can be used to insert or select automatically generated values. For example::
+
+      insert into logs
+        (user_id, timestamp)
+      values
+        (:_actor_id, :_timestamp_datetime_utc)
+ This inserts the currently authenticated actor ID and the current datetime. (`#842 <https://github.com/simonw/datasette/issues/842>`__)
 - New :ref:`plugin_hook_startup` plugin hook. (`#834 <https://github.com/simonw/datasette/issues/834>`__)
 - New :ref:`plugin_hook_canned_queries` plugin hook. See `datasette-saved-queries <https://github.com/simonw/datasette-saved-queries>`__ for an example of this hook in action. (`#852 <https://github.com/simonw/datasette/issues/852>`__)
 - Workaround for "Too many open files" error in test runs. (`#846 <https://github.com/simonw/datasette/issues/846>`__)
diff --git a/tests/fixtures.py b/tests/fixtures.py
index 432a76f5..f3fdc468 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -461,7 +461,7 @@ METADATA = {
             "queries": {
                 "𝐜𝐢𝐭𝐢𝐞𝐬": "select id, name from facet_cities order by id limit 1;",
                 "pragma_cache_size": "PRAGMA cache_size;",
-                "magic_parameters": "select :_header_user_agent as user_agent, :_date_datetime_utc as datetime",
+                "magic_parameters": "select :_header_user_agent as user_agent, :_timestamp_datetime_utc as datetime",
                 "neighborhood_search": {
                     "sql": textwrap.dedent(
                         """
diff --git a/tests/test_html.py b/tests/test_html.py
index 6bae9f5f..c80a7685 100644
--- a/tests/test_html.py
+++ b/tests/test_html.py
@@ -97,9 +97,9 @@ def test_database_page(app_client):
         ),
         ("/fixtures/from_async_hook", "from_async_hook"),
         ("/fixtures/from_hook", "from_hook"),
+        ("/fixtures/magic_parameters", "magic_parameters"),
         ("/fixtures/neighborhood_search#fragment-goes-here", "Search neighborhoods"),
         ("/fixtures/pragma_cache_size", "pragma_cache_size"),
-        ("/fixtures/magic_parameters", "magic_parameters"),
     ] == sorted(
         [(a["href"], a.text) for a in queries_ul.find_all("a")], key=lambda p: p[0]
     )