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-rw-r--r--Doc/library/os.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 0c2cab7..e5e00d0 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -662,7 +662,8 @@ as internal buffering of data.
For a description of the flag and mode values, see the C run-time documentation;
flag constants (like :const:`O_RDONLY` and :const:`O_WRONLY`) are defined in
- this module too (see :ref:`open-constants`).
+ this module too (see :ref:`open-constants`). In particular, on Windows adding
+ :const:`O_BINARY` is needed to open files in binary mode.
.. note::