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@@ -39,6 +39,11 @@ values on multiple lines.
Boolean values can be specified as ``on``, ``off``, ``true``, ``false``, ``1``,
or ``0`` and are case-insensitive.
+Environment variables can be substituted in by using dollar signs: ``$WORD``
+``${WORD}`` will be replaced with the value of ``WORD`` in the environment.
+A dollar sign can be inserted with ``$$``. Missing environment variables
+will result in empty strings with no error.
+
Many sections and values correspond roughly to commands and options in
the :ref:`command-line interface <cmd>`.