diff --git a/configuration/external_parameters.rst b/configuration/external_parameters.rst
index 18cd96e91da..837efaad070 100644
--- a/configuration/external_parameters.rst
+++ b/configuration/external_parameters.rst
@@ -494,6 +494,46 @@ Symfony provides the following env var processors:
.. versionadded:: 4.2
The ``key`` processor was introduced in Symfony 4.2.
+``env(default:fallback_param:BAR)``
+ Retrieves the value of the parameter ``fallback_param`` when the of the ``BAR`` env var is not available:
+
+ .. configuration-block::
+
+ .. code-block:: yaml
+
+ # config/services.yaml
+ parameters:
+ private_key: '%env(default:raw_key:file:PRIVATE_KEY)%'
+ raw_key: '%env(PRIVATE_KEY)%'
+ # if PRIVATE_KEY is not a valid file path, the content of raw_key is returned.
+
+ .. code-block:: xml
+
+
+
+
+
+
+ %env(default:raw_key:file:PRIVATE_KEY)%
+ %env(PRIVATE_KEY)%
+
+
+
+ .. code-block:: php
+
+ // config/services.php
+ $container->setParameter('private_key', '%env(default:raw_key:file:PRIVATE_KEY)%');
+ $container->setParameter('raw_key', '%env(PRIVATE_KEY)%');
+
+ .. versionadded:: 4.3
+ The ``default`` processor was introduced in Symfony 4.3.
+
It is also possible to combine any number of processors:
.. code-block:: yaml
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