From 87585a228119cd5c71ac71ea4fe13b10332a0192 Mon Sep 17 00:00:00 2001
From: Liangliang Gu <marsishandsome@gmail.com>
Date: Thu, 16 Apr 2020 15:22:26 +0800
Subject: [PATCH] tiflash: add warning to upgrade from pre-rc version (#2778)

---
 reference/tiflash/upgrade.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/reference/tiflash/upgrade.md b/reference/tiflash/upgrade.md
index 42b02ad712a2..d10f8d2da593 100644
--- a/reference/tiflash/upgrade.md
+++ b/reference/tiflash/upgrade.md
@@ -5,6 +5,10 @@ category: reference
 
 # 升级 TiFlash 节点
 
+> **注意：**
+>
+> TiFlash Pre-RC 版本升级到更高版本请联系 [PingCAP 官方](mailto:info@pingcap.com)，以获得更多资讯和帮助。
+
 目前 TiFlash 暂时还不支持通过 `tiup cluster upgrade` 进行升级。 推荐使用下面的步骤进行升级：
 
 1. 参考[缩容 TiFlash 节点](/how-to/scale/with-tiup.md#4-缩容-tiflash-节点)章节，对所有的 TiFlash 节点进行缩容操作