From ca58d49cb7d059aedf4340f16e7dab9497bc727a Mon Sep 17 00:00:00 2001
From: Mike Woofter <108414937+mongoKart@users.noreply.github.com>
Date: Mon, 2 Dec 2024 12:18:47 -0600
Subject: [PATCH 1/2] add note

---
 source/whats-new.txt | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/source/whats-new.txt b/source/whats-new.txt
index a6ccfef9..4b91c3f5 100644
--- a/source/whats-new.txt
+++ b/source/whats-new.txt
@@ -19,6 +19,7 @@ What's New
 
 Learn what's new in:
 
+* :ref:`Version 3.1 <csharp-version-3.1>`
 * :ref:`Version 3.0 <csharp-version-3.0>`
 * :ref:`Version 2.30 <csharp-version-2.30>`
 * :ref:`Version 2.29 <csharp-version-2.29>`
@@ -29,11 +30,22 @@ Learn what's new in:
 * :ref:`Version 2.24 <version-2.24>`
 * :ref:`Version 2.23 <version-2.23>`
 * :ref:`Version 2.22 <version-2.22>`
-* :ref:`Version 2.21 <version-2.21>`
 
 .. _upcoming-breaking-changes:
 
-.. _csharp-version-3.0:
+.. _csharp-version-3.1:
+
+What's New in 3.1
+-----------------
+
+.. _csharp-version-3.1:
+
+The 3.1 driver release includes the following new features:
+
+- Adds new default serializers for immutable collections in the
+  `System.Collections.Immutable <https://learn.microsoft.com/en-us/dotnet/api/system.collections.immutable?view=net-8.0>`__
+  namespace. The driver can now serialize ``ImmutableArray`` objects, and serialization
+  for other immutable collections is more memory efficient.
 
 What's New in 3.0
 -----------------

From 55bbeeaf1330ebac8d6f083ba6f44b178479fb2b Mon Sep 17 00:00:00 2001
From: Mike Woofter <108414937+mongoKart@users.noreply.github.com>
Date: Mon, 2 Dec 2024 12:23:30 -0600
Subject: [PATCH 2/2] fix labels

---
 source/whats-new.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/whats-new.txt b/source/whats-new.txt
index 4b91c3f5..7ec05b89 100644
--- a/source/whats-new.txt
+++ b/source/whats-new.txt
@@ -38,8 +38,6 @@ Learn what's new in:
 What's New in 3.1
 -----------------
 
-.. _csharp-version-3.1:
-
 The 3.1 driver release includes the following new features:
 
 - Adds new default serializers for immutable collections in the
@@ -47,6 +45,8 @@ The 3.1 driver release includes the following new features:
   namespace. The driver can now serialize ``ImmutableArray`` objects, and serialization
   for other immutable collections is more memory efficient.
 
+.. _csharp-version-3.0:
+
 What's New in 3.0
 -----------------