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diff --git a/parts/django/tests/modeltests/m2m_multiple/models.py b/parts/django/tests/modeltests/m2m_multiple/models.py
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+++ b/parts/django/tests/modeltests/m2m_multiple/models.py
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+"""
+20. Multiple many-to-many relationships between the same two tables
+
+In this example, an ``Article`` can have many "primary" ``Category`` objects
+and many "secondary" ``Category`` objects.
+
+Set ``related_name`` to designate what the reverse relationship is called.
+"""
+
+from django.db import models
+
+class Category(models.Model):
+    name = models.CharField(max_length=20)
+    class Meta:
+       ordering = ('name',)
+
+    def __unicode__(self):
+        return self.name
+
+class Article(models.Model):
+    headline = models.CharField(max_length=50)
+    pub_date = models.DateTimeField()
+    primary_categories = models.ManyToManyField(Category, related_name='primary_article_set')
+    secondary_categories = models.ManyToManyField(Category, related_name='secondary_article_set')
+    class Meta:
+       ordering = ('pub_date',)
+
+    def __unicode__(self):
+        return self.headline
+