From c36ffb015f8b102e4a5542ed48236e0c20a76a19 Mon Sep 17 00:00:00 2001
From: Lemon <liuhaoyang1221@hotmail.com>
Date: Thu, 1 Nov 2018 20:01:32 +0800
Subject: [PATCH] Update backend-storage docs (#1861)

---
 docs/en/setup/backend/backend-storage.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/en/setup/backend/backend-storage.md b/docs/en/setup/backend/backend-storage.md
index e75aa9e0f..e7de556c2 100644
--- a/docs/en/setup/backend/backend-storage.md
+++ b/docs/en/setup/backend/backend-storage.md
@@ -22,6 +22,8 @@ storage:
 ## ElasticSearch 6
 Active ElasticSearch 6 as storage, set storage provider to **elasticsearch**.
 
+> Required ElasticSearch 6.3.0 or higher.
+
 Setting fragment example
 ```yaml
 storage:
-- 
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