DOC Add new query trace comment to changelog

en/04_Changelogs/5.2.0.md

@@ -342,6 +342,7 @@ A [`LogicException`](https://www.php.net/manual/en/class.logicexception.php) is
 - You can now upload [Braille ASCII file format](https://en.wikipedia.org/wiki/Braille_ASCII) (`.brf`) files to the CMS without needing to modify the [allowed file types](/developer_guides/files/allowed_file_types/).
 - The assets admin section now respects the [`Upload_Validator.default_max_file_size`](api:SilverStripe\Assets\Upload_Validator->default_max_file_size) configuration if [`AssetAdmin.max_upload_size`](api:SilverStripe\AssetAdmin\Controller\AssetAdmin->max_upload_size) has not been explicitly set for your project. Previously, asset admin would ignore `Upload_Validator.default_max_file_size` and just use the PHP `upload_max_filesize` ini configuration by default.
 - Redirector pages with a link to a missing or unpublished page/file will now return a 404 response. You can revert to the previous behaviour by setting the [`RedirectorPageController.missing_redirect_is_404`](api:SilverStripe\CMS\Model\RedirectorPageController->missing_redirect_is_404) configuration property to `false`.
+- In dev mode, database queries will automatically have a comment indicating where they were executed from. This can be useful when debugging slow queries, e.g. with the [`showqueries` query string](/developer_guides/debugging/url_variable_tools/#database).
 
 ## API changes