diff --git a/components/form/form_events.rst b/components/form/form_events.rst
index 1b81360f529..b6f10e538ba 100644
--- a/components/form/form_events.rst
+++ b/components/form/form_events.rst
@@ -110,6 +110,9 @@ the form.
.. sidebar:: ``FormEvents::POST_SET_DATA`` in the Form component
+ .. versionadded:: 2.4
+ The data collector extension was introduced in Symfony 2.4.
+
The :class:`Symfony\\Component\\Form\\Extension\\DataCollector\\EventListener\\DataCollectorListener`
class is subscribed to listen to the ``FormEvents::POST_SET_DATA`` event
in order to collect information about the forms from the denormalized
@@ -218,6 +221,9 @@ It can be used to fetch data after denormalization.
.. sidebar:: ``FormEvents::POST_SUBMIT`` in the Form component
+ .. versionadded:: 2.4
+ The data collector extension was introduced in Symfony 2.4.
+
The :class:`Symfony\\Component\\Form\\Extension\\DataCollector\\EventListener\\DataCollectorListener`
subscribes to the ``FormEvents::POST_SUBMIT`` event in order to collect
information about the forms.
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