Add explanation about tag creation and cleanup (#32406)
* Add explanation about tag creation and cleanup
diff --git a/docs/apache-airflow/howto/add-dag-tags.rst b/docs/apache-airflow/howto/add-dag-tags.rst
index 7e75cec..5b7db76 100644
--- a/docs/apache-airflow/howto/add-dag-tags.rst
+++ b/docs/apache-airflow/howto/add-dag-tags.rst
@@ -38,3 +38,7 @@
**Screenshot**:
.. image:: ../img/add-dag-tags.png
+
+Tags are registered as part of dag parsing.
+In case of stale tags, you can purge old data with the Airflow CLI command ``airflow db clean``.
+See :ref:`db clean usage<cli-db-clean>` for more details.
