diff --git a/configuration/external_parameters.rst b/configuration/external_parameters.rst
index 5f2cdd3a83b..67598af81c9 100644
--- a/configuration/external_parameters.rst
+++ b/configuration/external_parameters.rst
@@ -533,6 +533,8 @@ Symfony provides the following env var processors:
$container->setParameter('private_key', '%env(default:raw_key:file:PRIVATE_KEY)%');
$container->setParameter('raw_key', '%env(PRIVATE_KEY)%');
+ When the fallback parameter is ommited (ie. ``env(default::API_KEY)``), the value retrieved is ``null``.
+
.. versionadded:: 4.3
The ``default`` processor was introduced in Symfony 4.3.
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