diff --git a/components/yaml.rst b/components/yaml.rst
index ec47ea6a9ee..ab237f371f3 100644
--- a/components/yaml.rst
+++ b/components/yaml.rst
@@ -379,6 +379,17 @@ objects, they are automatically transformed into YAML tags::
$dumped = Yaml::dump($data);
// $dumped = '!my_tag { foo: bar }'
+Dumping null
+~~~~~~~~~~~~~
+
+By default, the dumper will represent ``null`` values with ``null``::
+
+ Yaml::dump(array('foo' => null)); // foo: null
+
+You can make it represent them with ``~`` by using the ``DUMP_NULL_AS_TILDE`` flag::
+
+ Yaml::dump(array('foo' => null), 2, 4, Yaml::DUMP_NULL_AS_TILDE); // foo: ~
+
Syntax Validation
~~~~~~~~~~~~~~~~~
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