diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index 290ef0fc38635b..6d9348c547227d 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -415,12 +415,18 @@ arguments they contain. For example::
>>> parser.parse_args(['-f', 'foo', '@args.txt'])
Namespace(f='bar')
-Arguments read from a file must by default be one per line (but see also
+Arguments read from a file must be one per line by default (but see also
:meth:`~ArgumentParser.convert_arg_line_to_args`) and are treated as if they
were in the same place as the original file referencing argument on the command
line. So in the example above, the expression ``['-f', 'foo', '@args.txt']``
is considered equivalent to the expression ``['-f', 'foo', '-f', 'bar']``.
+.. note::
+
+ Empty lines are treated as empty strings (``''``), which are allowed as values but
+ not as arguments. Empty lines that are read as arguments will result in an
+ "unrecognized arguments" error.
+
:class:`ArgumentParser` uses :term:`filesystem encoding and error handler`
to read the file containing arguments.
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