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Update custom_constraint.rst #6610

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2 changes: 1 addition & 1 deletion cookbook/validation/custom_constraint.rst
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Expand Up @@ -158,7 +158,7 @@ Constraint Validators with Dependencies
If your constraint validator has dependencies, such as a database connection,
it will need to be configured as a service in the Dependency Injection
Container. This service must include the ``validator.constraint_validator``
tag and may include an ``alias`` attribute:
tag and *MUST* include an ``alias`` attribute:

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I'd add that alias must match what is returned by the validateBy method and that it must not necessarily match the service id

.. configuration-block::

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