From 01169022297d6a2b3cf4ae9aaba7436fe3601a3c Mon Sep 17 00:00:00 2001
From: TomShawn <41534398+TomShawn@users.noreply.github.com>
Date: Fri, 17 Apr 2020 17:37:23 +0800
Subject: [PATCH] tiflash: add warning to upgrade from pre-rc version (#2319)

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

diff --git a/reference/tiflash/upgrade.md b/reference/tiflash/upgrade.md
index 603548f94577f..e8dbc4be8c3fe 100644
--- a/reference/tiflash/upgrade.md
+++ b/reference/tiflash/upgrade.md
@@ -6,6 +6,10 @@ category: reference
 
 # Upgrade TiFlash Nodes
 
+> **Note:**
+>
+> To upgrade TiFlash from the Pre-RC version to a later version, contact [PingCAP](mailto:info@pingcap.com) for more information and help.
+
 Before the upgrade, make sure that the cluster is started. To upgrade TiFlash nodes, take the following steps:
 
 1. Run the upgrade command: