about south

when I try to make migration use: `manage.py schemamition app_name --auto`
and got the error like :

```
! Cannot freeze field 'app_name.model.field'
! (this field has class django_markdown.models.MarkdownField)

! South cannot introspect some fields; this is probably because they are custom
! fields. If they worked in 0.6 or below, this is because we have removed the
! models parser (it often broke things).
! To fix this, read http://south.aeracode.org/wiki/MyFieldsDontWork
```

but I can't understand the solution which the link give.

wish help. Thanks. :)
##

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Start with the linked South custom-field guidance and inspect the django_markdown.models.MarkdownField referenced in the error. Determine what migration support or documentation is missing for this field, then verify that the documented steps address the manage.py schemamigration command and its introspection error.

Written by the indexing model from the issue text.