api endpoint does not display properly

my drf project layout:

project:
    - urls.py
api:
- urls.py

In project/urls.py I defined the url routing like:

urlpatterns = [url(r'^api/', include('api.urls', namespace='api')),
                      url(r'^api-token-auth/', views.obtain_token),]

on the drf web page, it gives me api/api-token-auth as the endpoint but it should be api-token-auth/. Hope this issue can be quickly fixed. thanks!
