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-rw-r--r--doc/source/admin/configuration/cross-cell-resize.rst5
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diff --git a/doc/source/admin/configuration/cross-cell-resize.rst b/doc/source/admin/configuration/cross-cell-resize.rst
index 5b30c4f47c..b768d7bc8b 100644
--- a/doc/source/admin/configuration/cross-cell-resize.rst
+++ b/doc/source/admin/configuration/cross-cell-resize.rst
@@ -251,6 +251,11 @@ Other limitations:
source and destination compute host are not on shared storage or when
shelve offloading and unshelving a server with a config drive. If necessary,
the resized server can be rebuilt to regain the personality files.
+* The ``_poll_unconfirmed_resizes`` periodic task, which can be
+ :oslo.config:option:`configured <resize_confirm_window>` to automatically
+ confirm pending resizes on the target host, *might* not support cross-cell
+ resizes because doing so would require an :ref:`up-call <upcall>` to the
+ API to confirm the resize and cleanup the source cell database.
.. _personality files: https://docs.openstack.org/api-guide/compute/server_concepts.html#server-personality
.. _evacuating: https://docs.openstack.org/api-ref/compute/#evacuate-server-evacuate-action