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-rw-r--r--docs/topics/db/fetch-modes.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/topics/db/fetch-modes.txt b/docs/topics/db/fetch-modes.txt
index e76bb28a59..da7a07a0d4 100644
--- a/docs/topics/db/fetch-modes.txt
+++ b/docs/topics/db/fetch-modes.txt
@@ -29,6 +29,11 @@ Fetch modes apply to:
* Fields deferred with :meth:`.QuerySet.defer` or :meth:`.QuerySet.only`
* :ref:`generic-relations`
+Django copies the fetch mode of an instance to any related objects it fetches,
+so the mode applies to a whole tree of relationships, not just the top-level
+model in the initial ``QuerySet``. This copying is also done in related
+managers, even though fetch modes don't affect such managers' queries.
+
Available modes
===============