diff --git a/cookbook/validation/custom_constraint.rst b/cookbook/validation/custom_constraint.rst
index 0c42758dd93..e4903d7ff0d 100644
--- a/cookbook/validation/custom_constraint.rst
+++ b/cookbook/validation/custom_constraint.rst
@@ -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 should include an ``alias`` attribute to be used in the validatedBy method of your validator class:
.. configuration-block::
@@ -194,6 +194,9 @@ the constraint, with ``Validator`` appended. You can override this in your const
return 'Fully\Qualified\ConstraintValidator\Class\Name'; // or 'alias_name' if provided
}
+Make sure to use the 'alias_name' when you have configured your validator as a service. Otherwise your validator class
+will be simply instantiated without your dependencies.
+
Class Constraint Validator
~~~~~~~~~~~~~~~~~~~~~~~~~~
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