From 5101d97d0b13425ccc5ed37abfabb07701db81fe Mon Sep 17 00:00:00 2001
From: slateny <46876382+slateny@users.noreply.github.com>
Date: Wed, 20 Apr 2022 01:24:53 -0700
Subject: bpo-30718: Add information about text buffering (GH-32351)

---
 Doc/library/functions.rst | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index eaa4d48..e6fd0bb 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1165,7 +1165,11 @@ are always available.  They are listed here in alphabetical order.
    *buffering* is an optional integer used to set the buffering policy.  Pass 0
    to switch buffering off (only allowed in binary mode), 1 to select line
    buffering (only usable in text mode), and an integer > 1 to indicate the size
-   in bytes of a fixed-size chunk buffer.  When no *buffering* argument is
+   in bytes of a fixed-size chunk buffer. Note that specifying a buffer size this
+   way applies for binary buffered I/O, but ``TextIOWrapper`` (i.e., files opened
+   with ``mode='r+'``) would have another buffering. To disable buffering in
+   ``TextIOWrapper``, consider using the ``write_through`` flag for
+   :func:`io.TextIOWrapper.reconfigure`. When no *buffering* argument is
    given, the default buffering policy works as follows:
 
    * Binary files are buffered in fixed-size chunks; the size of the buffer is
-- 
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