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diff --git a/tests/m2o_recursive/models.py b/tests/m2o_recursive/models.py
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+"""
+11. Relating an object to itself, many-to-one
+
+To define a many-to-one relationship between a model and itself, use
+``ForeignKey('self')``.
+
+In this example, a ``Category`` is related to itself. That is, each
+``Category`` has a parent ``Category``.
+
+Set ``related_name`` to designate what the reverse relationship is called.
+"""
+
+from django.db import models
+from django.utils.encoding import python_2_unicode_compatible
+
+
+@python_2_unicode_compatible
+class Category(models.Model):
+    name = models.CharField(max_length=20)
+    parent = models.ForeignKey('self', blank=True, null=True, related_name='child_set')
+
+    def __str__(self):
+        return self.name
+
+@python_2_unicode_compatible
+class Person(models.Model):
+    full_name = models.CharField(max_length=20)
+    mother = models.ForeignKey('self', null=True, related_name='mothers_child_set')
+    father = models.ForeignKey('self', null=True, related_name='fathers_child_set')
+
+    def __str__(self):
+        return self.full_name