Document our custom Django settings

docs/reference/settings.md

@@ -0,0 +1,34 @@
+# Settings
+
+Django Subatomic has some custom [Django settings][django-settings]
+to help with the process of adopting it in existing projects.
+
+## `SUBATOMIC_AFTER_COMMIT_NEEDS_TRANSACTION`
+
+(default: `True`)
+
+When this setting is `True`,
+[`run_after_commit`][django_subatomic.db.run_after_commit] will raise an exception if no transaction is open.
+
+This setting is intended to help projects
+transition to this strict behaviour
+by getting it working in tests
+before enabling it in production.
+
+## `SUBATOMIC_RUN_AFTER_COMMIT_CALLBACKS_IN_TESTS`
+
+(default: `True`)
+
+When this setting is `True`,
+after-commit callbacks will be run in tests
+when a [`transaction`][django_subatomic.db.transaction]
+(or [`transaction_if_not_already`][django_subatomic.db.transaction_if_not_already])
+context is exited.
+
+This setting is intended to help projects
+progressively enable after-commit callbacks in tests
+by using [`override_settings`][override_settings]
+on a per-test basis.
+
+[override_settings]: https://docs.djangoproject.com/en/stable/topics/testing/tools/#django.test.override_settings
+[django-settings]: https://docs.djangoproject.com/en/stable/topics/settings/

mkdocs.yml

@@ -1,6 +1,8 @@
 site_name: Django-subatomic docs
 repo_name: kraken-tech/django-subatomic
 repo_url: https://github.com/kraken-tech/django-subatomic
+watch:
+  - src
 theme:
   name: material
   logo: static/img/logo.png