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diff --git a/doc/config.txt b/doc/config.txt
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@@ -206,6 +206,10 @@ Complete list of settings that you can put into ``testenv*`` sections:
``TMPDIR`` will be passed down. You can override these variables
with the ``setenv`` option.
+ If defined the ``TOX_TESTENV_PASSENV`` environment variable (in the tox
+ invocation environment) can define additional space-separated variable
+ names that are to be passed down to the test command environment.
+
.. confval:: recreate=True|False(default)
Always recreate virtual environment if this option is True.