* In a Session flush operation, if two objects are mutually dependent
on each other, they can not be inserted or deleted via INSERT or
- DELETE statements alone; an UPDATE will be needed to deassociate
- one of the foreign key constraints first. The ``post_update`` flag
- described at :ref:`post_update` can resolve this cycle.
+ DELETE statements alone; an UPDATE will be needed to post-associate
+ or pre-deassociate one of the foreign key constrained values.
+ The ``post_update`` flag described at :ref:`post_update` can resolve
+ this cycle.
* In a :meth:`.MetaData.create_all`, :meth:`.MetaData.drop_all`,
:attr:`.MetaData.sorted_tables` operation, two :class:`.ForeignKey`
or :class:`.ForeignKeyConstraint` objects mutually refer to each