When an application retrieves serialized objects for which the class has changed, it may have to cope with modifications of the semantics. While there are numerous ways to handle the resulting mismatch at runtime, the developer is typically required to provide some code to reestablish the intended semantics of the new class. The present article shows how to instruct an IDE with class version information, in a way that it can provide the developer with help and guidance for a semantically correct schema evolution.