title: Difference between admin.site.root and admin.site.urls
body: <p>In the <a href="http://www.djangobook.com/en/2.0/chapter06/" rel="nofollow noreferrer">The Django Book</a> in chapter 6 about the Admin Site, they tell me to add the follwing URLpattern to urls.py:</p>
  
  <pre><code>urlpatterns = patterns('',
      # ...
      (r'^admin/', include(admin.site.urls)),
      # ...
  )
  </code></pre>
  
  <p>But to make it work on my system, I had to uncomment the following line:</p>
  
  <pre><code>(r'^admin/(.*)', admin.site.root),
  </code></pre>
  
  <p>Can somebody enlighten me on what the differences are?</p>