bpo-34844: logging.Formatter enhancement - Ensure style and format string matches in logging.Formatter  (GH-9703)

diff --git a/Doc/library/logging.rst b/Doc/library/logging.rst
index c63ea21..71a46ac 100644
--- a/Doc/library/logging.rst
+++ b/Doc/library/logging.rst
@@ -544,6 +544,10 @@
    .. versionchanged:: 3.2
       The *style* parameter was added.
 
+   .. versionchanged:: 3.8
+      The *validate* parameter was added. Incorrect or mismatched style and fmt
+      will raise a ``ValueError``.
+      For example: ``logging.Formatter('%(asctime)s - %(message)s', style='{')``.
 
    .. method:: format(record)