diff --git a/docs/topics/db/queries.txt b/docs/topics/db/queries.txt
index a1cb5c79c5..39ef2b33fd 100644
--- a/docs/topics/db/queries.txt
+++ b/docs/topics/db/queries.txt
@@ -102,7 +102,8 @@ Saving ``ForeignKey`` and ``ManyToManyField`` fields
 Updating a :class:`~django.db.models.ForeignKey` field works exactly the same
 way as saving a normal field -- simply assign an object of the right type to
 the field in question. This example updates the ``blog`` attribute of an
-``Entry`` instance ``entry``::
+``Entry`` instance ``entry``, assuming appropriate instances of ``Entry`` and
+``Blog`` are already saved to the database (so we can retrieve them below)::
 
     >>> from blog.models import Entry
     >>> entry = Entry.objects.get(pk=1)