diff --git a/reference/constraints/Expression.rst b/reference/constraints/Expression.rst
index 593aa4b8ba7..877b45c4004 100644
--- a/reference/constraints/Expression.rst
+++ b/reference/constraints/Expression.rst
@@ -244,6 +244,14 @@ in your expression:
 * ``value``: The value of the property being validated (only available when
   the constraint is applied directly to a property);
 
+You also have access to the ``is_valid()`` function in your expression. It
+allows to check that the data passed to function doesn't raise any
+validation violation.
+
+.. versionadded:: 6.4
+
+    The ``is_valid()`` expression function was introduced in Symfony 6.4.
+
 .. include:: /reference/constraints/_groups-option.rst.inc
 
 ``message``