Add missing versionadded directive. refs #11956

OskarStark · OskarStark · commit 84c200acb75d · 2019-08-06T09:56:10.000+02:00
diff --git a/components/dotenv.rst b/components/dotenv.rst
@@ -151,11 +151,15 @@ Use environment variables in values by prefixing variables with ``$``:
 
 Define a default value in case the environment variable is not set:
 
- .. code-block:: terminal
+.. code-block:: terminal
 
     DB_USER=
     DB_PASS=${DB_USER:-root}pass # results in DB_PASS=rootpass
 
+.. versionadded:: 4.4
+
+    The support for default values has been introduced in Symfony 4.4.
+
 Embed commands via ``$()`` (not supported on Windows):
 
 .. code-block:: terminal
