diff --git a/src/LiveComponent/doc/index.rst b/src/LiveComponent/doc/index.rst
index a473881d50b..ad92c857867 100644
--- a/src/LiveComponent/doc/index.rst
+++ b/src/LiveComponent/doc/index.rst
@@ -1490,6 +1490,10 @@ How this works:
 #. During that Ajax call, the form is submitted using ``$formValues``, the
    form re-renders, and the page is updated.
 
+To render validation errors for fields using the ``data-model`` attribute,
+you must set ``$this->isValidated = true;`` in the constructor of the live
+component using the ``ComponentWithFormTrait``.
+
 Build the "New Post" Form Component
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~