Changing South Migration Directory

How do you change the location where South looks for an app's migrations?

By default, South assumes an app's migrations are in /migrations. However, I've migrated the model of a third-party package which is installed at /usr/local/lib/python-2.6/di开发者_开发问答st-packages/, so South is looking for migrations there, instead of the location of my custom codebase.

In settings.py:

SOUTH_MIGRATION_MODULES = {
    'books': 'myproject.app_name.migrations',
}