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diff --git a/docs/topics/testing/overview.txt b/docs/topics/testing/overview.txt
index d345e9c36d..fc18eb0e4a 100644
--- a/docs/topics/testing/overview.txt
+++ b/docs/topics/testing/overview.txt
@@ -250,6 +250,13 @@ The initial serialization is usually very quick, but if you wish to exclude
some apps from this process (and speed up test runs slightly), you may add
those apps to :setting:`TEST_NON_SERIALIZED_APPS`.
+.. versionchanged:: 1.9
+
+To prevent serialized data from being loaded twice, setting
+``serialized_rollback=True`` disables the
+:data:`~django.db.models.signals.post_migrate` signal when flushing the test
+database.
+
Other test conditions
---------------------