diff --git a/doc/deprecated.rst b/doc/deprecated.rst
index 3444dffa8d3..1bbc7941306 100644
--- a/doc/deprecated.rst
+++ b/doc/deprecated.rst
@@ -18,6 +18,11 @@ doesn't seem to be an obvious alternative, contact the developers to
 explain your use case if you want to make sure your code continues to
 work.
 
+Platform Support Deprecations
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+* Support for building for Windows systems prior to Windows 10 is deprecated.
+
 TLS Protocol Deprecations
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^