Mar 3, 2017 · Sep 18, 2016
diff --git a/components/serializer.rst b/components/serializer.rst
 #. The name of the class this information will be decoded to
 #. The encoder used to convert that information into an array

 By default, additional attributes that are not mapped to the denormalized object will be ignored
 by the Serializer component. Set the ``allow_extra_attributes`` key of the deserialization context to ``false``
 to let the serializer throw an exception when additional attributes are passed.

 This will throw an :class:`Symfony\\Component\\Serializer\\Exception\\ExtraAttributesException` exception,
 because city is not an attribute of the ``Person`` class::

    $data = <<<EOF
    <person>
        <name>foo</name>
        <age>99</age>
        <city>Paris</city>
    </person>
    EOF;

    $person = $serializer->deserialize($data, 'Acme\Person', 'xml', array(
        'allow_extra_attributes' => false,
    ));


 Deserializing in an Existing Object
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Original file line number	Diff line number	Diff line change
Expand Up		@@ -151,6 +151,26 @@ needs three parameters:
		#. The name of the class this information will be decoded to
		#. The encoder used to convert that information into an array

		By default, additional attributes that are not mapped to the denormalized object will be ignored
		by the Serializer component. Set the ``allow_extra_attributes`` key of the deserialization context to ``false``
		to let the serializer throw an exception when additional attributes are passed.

		This will throw an :class:`Symfony\\Component\\Serializer\\Exception\\ExtraAttributesException` exception,
		because city is not an attribute of the ``Person`` class::

		$data = <<<EOF
		<person>
		<name>foo</name>
		<age>99</age>
		<city>Paris</city>
		</person>
		EOF;

		$person = $serializer->deserialize($data, 'Acme\Person', 'xml', array(
		'allow_extra_attributes' => false,
		));


		Deserializing in an Existing Object
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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