Allow LZMAFile to accept modes with a "b" suffix.
diff --git a/Doc/library/lzma.rst b/Doc/library/lzma.rst
index 156d77a..67e425d 100644
--- a/Doc/library/lzma.rst
+++ b/Doc/library/lzma.rst
@@ -40,9 +40,11 @@
file will not be closed when the :class:`LZMAFile` is closed.
The *mode* argument can be either ``"r"`` for reading (default), ``"w"`` for
- overwriting, or ``"a"`` for appending. If *filename* is an existing file
- object, a mode of ``"w"`` does not truncate the file, and is instead
- equivalent to ``"a"``.
+ overwriting, or ``"a"`` for appending. These can equivalently be given as
+ ``"rb"``, ``"wb"``, and ``"ab"`` respectively.
+
+ If *filename* is a file object (rather than an actual file name), a mode of
+ ``"w"`` does not truncate the file, and is instead equivalent to ``"a"``.
When opening a file for reading, the input file may be the concatenation of
multiple separate compressed streams. These are transparently decoded as a