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-rw-r--r--Doc/using/cmdline.rst5
1 files changed, 3 insertions, 2 deletions
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 5cb9071770..598eb2583d 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -277,8 +277,9 @@ Miscellaneous options
.. cmdoption:: -R
- Kept for compatibility. On Python 3.3 and greater, hash randomization is
- turned on by default.
+ Turn on hash randomization. This option only has an effect if the
+ :envvar:`PYTHONHASHSEED` environment variable is set to ``0``, since hash
+ randomization is enabled by default.
On previous versions of Python, this option turns on hash randomization,
so that the :meth:`__hash__` values of str, bytes and datetime