From 3d78f5d70427d23ef1a2c87c2c1f2a01957e3b17 Mon Sep 17 00:00:00 2001
From: cloudchrischan <chrischan@google.com>
Date: Mon, 5 Jan 2026 16:55:09 -0800
Subject: [PATCH] Update README.md

---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index afac0b7..81bf0cd 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # Ray TPU
 
+> [!NOTE]
+> This project is no longer under active development. Most of its capabilities,
+> including multi-host/multi-slice, have been [upstreamed](https://github.com/ray-project/ray/blob/master/python/ray/util/tpu.py)
+> to OSS Ray.
+
 This is a repository containing utilities for running [Ray](https://www.ray.io/)
 on Cloud TPUs. For more information about TPUs, please check out the official
 Google Cloud documentation [here](https://cloud.google.com/tpu).