Index: tests/modeltests/basic/models.py
===================================================================
--- tests/modeltests/basic/models.py	(wersja 6231)
+++ tests/modeltests/basic/models.py	(kopia robocza)
@@ -384,4 +384,15 @@
 >>> a.save()
 >>> Article.objects.get(pk=a.id).headline
 u'\u6797\u539f \u3081\u3050\u307f'
+
+# It is possible to change primary key value
+>>> bc = Article(headline="primary changed article", pub_date=datetime(2008, 1, 1))
+>>> bc.save()
+>>> total = Article.objects.all().count()
+
+# After changing primary key value we still have same number of objects
+>>> bc.id = 999
+>>> bc.save()
+>>> print total == Article.objects.all().count()
+True
 """