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diff --git a/tests/modeltests/custom_pk/models.py b/tests/modeltests/custom_pk/models.py
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+"""
+14. Using a custom primary key
+
+By default, Django adds an ``"id"`` field to each model. But you can override
+this behavior by explicitly adding ``primary_key=True`` to a field.
+"""
+
+from django.db import models
+
+class Employee(models.Model):
+    employee_code = models.CharField(maxlength=10, primary_key=True)
+    first_name = models.CharField(maxlength=20)
+    last_name = models.CharField(maxlength=20)
+    class Meta:
+        ordering = ('last_name', 'first_name')
+
+    def __repr__(self):
+        return "%s %s" % (self.first_name, self.last_name)
+
+class Business(models.Model):
+    name = models.CharField(maxlength=20, primary_key=True)
+    employees = models.ManyToManyField(Employee)
+    class Meta:
+        verbose_name_plural = 'businesses'
+
+    def __repr__(self):
+        return self.name
+
+API_TESTS = """
+>>> dan = Employee(employee_code='ABC123', first_name='Dan', last_name='Jones')
+>>> dan.save()
+>>> Employee.objects.all()
+[Dan Jones]
+
+>>> fran = Employee(employee_code='XYZ456', first_name='Fran', last_name='Bones')
+>>> fran.save()
+>>> Employee.objects.all()
+[Fran Bones, Dan Jones]
+
+>>> Employee.objects.get(pk='ABC123')
+Dan Jones
+>>> Employee.objects.get(pk='XYZ456')
+Fran Bones
+>>> Employee.objects.get(pk='foo')
+Traceback (most recent call last):
+    ...
+DoesNotExist: Employee does not exist for {'pk': 'foo'}
+
+# Use the name of the primary key, rather than pk.
+>>> Employee.objects.get(employee_code__exact='ABC123')
+Dan Jones
+
+# Fran got married and changed her last name.
+>>> fran = Employee.objects.get(pk='XYZ456')
+>>> fran.last_name = 'Jones'
+>>> fran.save()
+>>> Employee.objects.filter(last_name__exact='Jones')
+[Dan Jones, Fran Jones]
+>>> Employee.objects.in_bulk(['ABC123', 'XYZ456'])
+{'XYZ456': Fran Jones, 'ABC123': Dan Jones}
+
+>>> b = Business(name='Sears')
+>>> b.save()
+>>> b.employees.add(dan, fran)
+>>> b.employees.all()
+[Dan Jones, Fran Jones]
+>>> fran.business_set.all()
+[Sears]
+>>> Business.objects.in_bulk(['Sears'])
+{'Sears': Sears}
+
+>>> Business.objects.filter(name__exact='Sears')
+[Sears]
+>>> Business.objects.filter(pk='Sears')
+[Sears]
+
+# Queries across tables, involving primary key
+>>> Employee.objects.filter(business__name__exact='Sears')
+[Dan Jones, Fran Jones]
+>>> Employee.objects.filter(business__pk='Sears')
+[Dan Jones, Fran Jones]
+
+>>> Business.objects.filter(employees__employee_code__exact='ABC123')
+[Sears]
+>>> Business.objects.filter(employees__pk='ABC123')
+[Sears]
+>>> Business.objects.filter(employees__first_name__startswith='Fran')
+[Sears]
+
+"""