AbstractConcreteBase class provides incorrect example

The docstring for AbstractConcreteBase shows the following example:

from sqlalchemy.ext.declarative import ConcreteBase

class Employee(AbstractConcreteBase, Base):
    pass

class Manager(Employee):
    __tablename__ = 'manager'
    employee_id = Column(Integer, primary_key=True)
    name = Column(String(50))
    manager_data = Column(String(40))
    __mapper_args__ = {
                    'polymorphic_identity':'manager',
                    'concrete':True}

This first line imports ConcreteBase, when really it should import AbstractConcreteBase

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