diff --git a/components/yaml.rst b/components/yaml.rst
index c3f355ab1da..bc6a4bc3634 100644
--- a/components/yaml.rst
+++ b/components/yaml.rst
@@ -375,6 +375,23 @@ objects, they are automatically transformed into YAML tags::
$dumped = Yaml::dump($data);
// $dumped = '!my_tag { foo: bar }'
+Dumping null
+~~~~~~~~~~~~
+
+``null`` values will be represented with ``null`` by default::
+
+ $dumped = Yaml::dump(array('foo' => null));
+ // foo: null
+
+You can represent them with ``~`` by using the ``DUMP_NULL_AS_TILDE`` flag::
+
+ $dumped = Yaml::dump(array('foo' => null), 2, 4, Yaml::DUMP_NULL_AS_TILDE);
+ // foo: ~
+
+.. versionadded:: 4.4
+
+ The flag to dump ``null`` as ``~`` was introduced in Symfony 4.4.
+
Syntax Validation
~~~~~~~~~~~~~~~~~
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