From 09225480693c83ff60da6007a9c7512a4cdd4097 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=90=B4=E6=99=9F=20Wu=20Sheng?= <wu.sheng@foxmail.com>
Date: Thu, 27 Jun 2019 00:14:37 +0800
Subject: [PATCH] Update backend-storage.md (#2950)

---
 docs/en/setup/backend/backend-storage.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docs/en/setup/backend/backend-storage.md b/docs/en/setup/backend/backend-storage.md
index 3d897d112..da0a78c07 100644
--- a/docs/en/setup/backend/backend-storage.md
+++ b/docs/en/setup/backend/backend-storage.md
@@ -53,6 +53,9 @@ storage:
     concurrentRequests: ${SW_STORAGE_ES_CONCURRENT_REQUESTS:2} # the number of concurrent requests
 ```
 
+### Data TTL
+TTL in ElasticSearch overrides the settings of core, read [ElasticSearch section in TTL document](ttl.md#elasticsearch-6-storage-ttl)
+
 ### ElasticSearch 6 with Zipkin trace extension
 This implementation shares most of `elasticsearch`, just extend to support zipkin span storage.
 It has all same configs.