diff --git a/UPGRADE-6.1.md b/UPGRADE-6.1.md
index 514c18c5b319d..d48aca725b3f6 100644
--- a/UPGRADE-6.1.md
+++ b/UPGRADE-6.1.md
@@ -33,3 +33,5 @@ Validator
 
  * Deprecate `Constraint::$errorNames`, use `Constraint::ERROR_NAMES` instead
  * Deprecate constraint `ExpressionLanguageSyntax`, use `ExpressionSyntax` instead
+ * Implementing the `ConstraintViolationInterface` or `ConstraintViolationListInterface`
+   without implementing the `__toString()` method is deprecated
diff --git a/src/Symfony/Component/Validator/CHANGELOG.md b/src/Symfony/Component/Validator/CHANGELOG.md
index bdb42bcd213ba..1b395fc45eed4 100644
--- a/src/Symfony/Component/Validator/CHANGELOG.md
+++ b/src/Symfony/Component/Validator/CHANGELOG.md
@@ -6,6 +6,7 @@ CHANGELOG
 
  * Deprecate `Constraint::$errorNames`, use `Constraint::ERROR_NAMES` instead
  * Deprecate constraint `ExpressionLanguageSyntax`, use `ExpressionSyntax` instead
+ * Add method `__toString()` to `ConstraintViolationInterface` & `ConstraintViolationListInterface`
 
 6.0
 ---
diff --git a/src/Symfony/Component/Validator/ConstraintViolation.php b/src/Symfony/Component/Validator/ConstraintViolation.php
index 713248c0f915a..4fb8b0a7cac77 100644
--- a/src/Symfony/Component/Validator/ConstraintViolation.php
+++ b/src/Symfony/Component/Validator/ConstraintViolation.php
@@ -64,7 +64,7 @@ public function __construct(string|\Stringable $message, ?string $messageTemplat
     }
 
     /**
-     * Converts the violation into a string for debugging purposes.
+     * {@inheritdoc}
      */
     public function __toString(): string
     {
diff --git a/src/Symfony/Component/Validator/ConstraintViolationInterface.php b/src/Symfony/Component/Validator/ConstraintViolationInterface.php
index 927fa66f0eb40..6fc584116eaad 100644
--- a/src/Symfony/Component/Validator/ConstraintViolationInterface.php
+++ b/src/Symfony/Component/Validator/ConstraintViolationInterface.php
@@ -30,6 +30,8 @@
  * element is still the person, but the property path is "address.street".
  *
  * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @method string __toString() Converts the violation into a string for debugging purposes. Not implementing it is deprecated since Symfony 6.1.
  */
 interface ConstraintViolationInterface
 {
diff --git a/src/Symfony/Component/Validator/ConstraintViolationList.php b/src/Symfony/Component/Validator/ConstraintViolationList.php
index a91f0413da27a..a0b157ea0034c 100644
--- a/src/Symfony/Component/Validator/ConstraintViolationList.php
+++ b/src/Symfony/Component/Validator/ConstraintViolationList.php
@@ -46,7 +46,7 @@ public static function createFromMessage(string $message): self
     }
 
     /**
-     * Converts the violation into a string for debugging purposes.
+     * {@inheritdoc}
      */
     public function __toString(): string
     {
diff --git a/src/Symfony/Component/Validator/ConstraintViolationListInterface.php b/src/Symfony/Component/Validator/ConstraintViolationListInterface.php
index 85eafd65e74f3..241e426105105 100644
--- a/src/Symfony/Component/Validator/ConstraintViolationListInterface.php
+++ b/src/Symfony/Component/Validator/ConstraintViolationListInterface.php
@@ -18,6 +18,8 @@
  *
  * @extends \ArrayAccess<int, ConstraintViolationInterface>
  * @extends \Traversable<int, ConstraintViolationInterface>
+ *
+ * @method string __toString() Converts the violation into a string for debugging purposes. Not implementing it is deprecated since Symfony 6.1.
  */
 interface ConstraintViolationListInterface extends \Traversable, \Countable, \ArrayAccess
 {