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doc/CHANGES.txt

@@ -162,7 +162,10 @@ Zope Changes
        ZCatalog or instances of classes with ZCatalog as base class will be
        migrated automatically. Instances of Catalog or classes with Catalog
        as base class must be migrated manually by calling the migrate__len__()
-       method on the every instance.
+       method on the every instance. In addition old BTree migration code
+       (for pre-Zope 2.5 instances) has been removed. If you want to migrate
+       from such an old version to Zope 2.8, you need to clear and reindex
+       your ZCatalog).
  
      - Collector #1457: ZCTextIndex's QueryError and ParseError 
        are now available for import from untrusted code.