From cad8aad6e320e25c2d73d346a5243029866e6190 Mon Sep 17 00:00:00 2001
From: Patrick Hoefler <61934744+phofl@users.noreply.github.com>
Date: Mon, 27 Nov 2023 22:21:35 +0100
Subject: [PATCH] Update base.py

---
 pandas/core/internals/base.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pandas/core/internals/base.py b/pandas/core/internals/base.py
index ee45707791fbf..5ac82c25bcde9 100644
--- a/pandas/core/internals/base.py
+++ b/pandas/core/internals/base.py
@@ -54,6 +54,11 @@
 
 class _AlreadyWarned:
     def __init__(self):
+        # This class is used on the manager level to the block level to 
+        # ensure that we warn only once. The block method can update the
+        # warned_already option without returning a value to keep the 
+        # interface consistent. This is only a temporary solution for 
+        # CoW warnings.
         self.warned_already = False