diff --git a/docs/topics/migrations.txt b/docs/topics/migrations.txt index 65f6b7cfef..514323a1f4 100644 --- a/docs/topics/migrations.txt +++ b/docs/topics/migrations.txt @@ -412,11 +412,11 @@ classes will need to be kept around for as long as there is a migration referencing them. Any :doc:`custom model fields ` will also need to be kept, since these are imported directly by migrations. -In addition, the base classes of the model are stored as pointers, so you must -always keep base classes around for as long as there is a migration that -contains a reference to them. On the plus side, methods and managers from these -base classes inherit normally, so if you absolutely need access to these you -can opt to move them into a superclass. +In addition, the concrete base classes of the model are stored as pointers, so +you must always keep base classes around for as long as there is a migration +that contains a reference to them. On the plus side, methods and managers from +these base classes inherit normally, so if you absolutely need access to these +you can opt to move them into a superclass. To remove old references, you can :ref:`squash migrations ` or, if there aren't many references, copy them into the migration files.