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-rw-r--r--docs/internals/deprecation.txt2
-rw-r--r--docs/releases/3.1.txt4
2 files changed, 6 insertions, 0 deletions
diff --git a/docs/internals/deprecation.txt b/docs/internals/deprecation.txt
index 2d7a72ae2f..3774afa59e 100644
--- a/docs/internals/deprecation.txt
+++ b/docs/internals/deprecation.txt
@@ -52,6 +52,8 @@ details on these changes.
* Support for the pre-Django 3.1 password reset tokens in the admin site (that
use the SHA-1 hashing algorithm) will be removed.
+* Support for the pre-Django 3.1 encoding format of sessions will be removed.
+
* The ``get_request`` argument for
``django.utils.deprecation.MiddlewareMixin.__init__()`` will be required and
won't accept ``None``.
diff --git a/docs/releases/3.1.txt b/docs/releases/3.1.txt
index d4ab35a310..669f2ca01e 100644
--- a/docs/releases/3.1.txt
+++ b/docs/releases/3.1.txt
@@ -539,6 +539,10 @@ Miscellaneous
from the format generated by older versions of Django. Support for the old
format remains until Django 4.0.
+* The encoding format of sessions is different from the format generated by
+ older versions of Django. Support for the old format remains until Django
+ 4.0.
+
.. _removed-features-3.1:
Features removed in 3.1