From 15f4034c47fa1c88ea757341135187cef161b4da Mon Sep 17 00:00:00 2001
From: spencerkclark <spencerkclark@gmail.com>
Date: Sun, 29 Jan 2023 07:35:58 -0500
Subject: [PATCH] [test-upstream] Add references to pandas PRs for _NoDefault

---
 xarray/coding/cftime_offsets.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xarray/coding/cftime_offsets.py b/xarray/coding/cftime_offsets.py
index 433b21e5d6d..f5304d10053 100644
--- a/xarray/coding/cftime_offsets.py
+++ b/xarray/coding/cftime_offsets.py
@@ -858,6 +858,12 @@ def _generate_range(start, end, periods, offset):
 class _NoDefault(Enum):
     """Used by pandas to specify a default value for a deprecated argument.
     Copied from pandas._libs.lib._NoDefault.
+
+    See also:
+    - pandas-dev/pandas#30788
+    - pandas-dev/pandas#40684
+    - pandas-dev/pandas#40715
+    - pandas-dev/pandas#47045
     """
 
     no_default = "NO_DEFAULT"