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-rw-r--r--docs/topics/serialization.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/topics/serialization.txt b/docs/topics/serialization.txt
index 5db8ca569b..398880ca93 100644
--- a/docs/topics/serialization.txt
+++ b/docs/topics/serialization.txt
@@ -59,7 +59,8 @@ specify a ``fields`` argument to the serializer::
data = serializers.serialize('xml', SomeModel.objects.all(), fields=('name','size'))
In this example, only the ``name`` and ``size`` attributes of each model will
-be serialized.
+be serialized. The primary key is always serialized as the ``pk`` element in the
+resulting output; it never appears in the ``fields`` part.
.. note::