note about 4.0

Author: mongoKart

source/reference/release-notes.txt

@@ -21,6 +21,7 @@ Release Notes
 
 Learn what's new in:
 
+* :ref:`Version 3.5 <csharp-version-3.5>`
 * :ref:`Version 3.4 <csharp-version-3.4>`
 * :ref:`Version 3.3 <csharp-version-3.3>`
 * :ref:`Version 3.2 <csharp-version-3.2>`
@@ -35,13 +36,15 @@ Learn what's new in:
 
 .. _upcoming-breaking-changes:
 
-Upcoming Breaking Changes
--------------------------
+.. _csharp-version-3.5:
 
-In accordance with the `MongoDB Software Lifecycle Schedules
-<https://www.mongodb.com/legal/support-policy/lifecycles>`__, an upcoming minor
-version of {+driver-short+} will raise the minimum {+mdb-server+} version from
-4.0 to 4.2. {+driver-short+} will no longer support {+mdb-server+} 4.0.
+What's New in 3.5
+-----------------
+
+.. warning:: Breaking Changes in v3.5
+
+   {+driver-long+} 3.5 contains breaking changes. See :ref:`<csharp-breaking-changes-v3.5>`
+   for more information.
 
 .. _csharp-version-3.4:
 

source/reference/upgrade/v3.txt

@@ -46,6 +46,22 @@ To upgrade the {+driver-short+} to version 3.0, follow these steps:
       to upgrade your driver to v{+last-version-2-number+}. Then, address all breaking
       changes for v3.0.
 
+
+.. _csharp-breaking-changes-v3.5:
+
+Version 3.5 Breaking Changes
+----------------------------
+
+- The driver drops support for {+mdb-server+} 4.0 and earlier. You must upgrade
+  your {+mdb-server+} to v4.2 or later.
+
+  To learn how to upgrade your {+mdb-server+} deployment, see
+  :manual:`Release Notes </release-notes/>` in the {+mdb-server+} manual.
+
+  To learn more about the compatibility between .NET/C# driver versions
+  and {+mdb-server+} versions, visit the
+  :ref:`Compatibility <csharp-compatibility-tables>` page.
+
 .. _csharp-breaking-changes-v3:
 
 Version 3.0 Breaking Changes