diff --git a/notify.md b/notify.md
index 7b05011..d047f92 100644
--- a/notify.md
+++ b/notify.md
@@ -152,8 +152,26 @@ acme.sh --set-notify  --notify-hook slack
 
 The `SLACK_WEBHOOK_URL`, `SLACK_CHANNEL` and `SLACK_USERNAME` will be saved in ~/.acme.sh/account.conf and will be reused when needed.
 
+## 5. Set notification for Slack App
 
-## 5. Set notification for postmarkapp.com
+Create [a Slack app](https://api.slack.com/apps) and allow the app to send messages by granting the `chat:write` permission. Once the app was allowed to send messages you need to install the app into your workspace.
+
+Slack channel and the App token can be configured via the following environement variables:
+
+```sh
+export SLACK_APP_CHANNEL="..."
+export SLACK_APP_TOKEN="xoxb-..."
+```
+
+Once the requried parameters have been configured you can setup the notification hook via the following command:
+
+```
+acme.sh --set-notify  --notify-hook slack_app
+```
+
+The `SLACK_APP_CHANNEL` and `SLACK_APP_TOKEN` will be saved in ~/.acme.sh/account.conf and will be reused when needed.
+
+## 6. Set notification for postmarkapp.com
 
 Send notification by postmarkapp.com API. The notification email will be sent to your email address. First get your [token](https://account.postmarkapp.com), then set it in your systems environment:
 
@@ -178,7 +196,7 @@ The `POSTMARK_TOKEN`, `POSTMARK_TO` and `POSTMARK_FROM` will be saved in ~/.acme
 
 If there are any bugs for postmarkapp.com API, please report here: https://github.com/Neilpang/acme.sh/issues/2309
 
-## 6. Set notification for pushover.net
+## 7. Set notification for pushover.net
 
 Send notification via pushover.net's api. The notification will be pushed to the specified pushover application.
 
@@ -212,7 +230,7 @@ The PUSHOVER_TOKEN, PUSHOVER_USER and PUSHOVER_SOUND will be saved in ~/.acme.sh
 
 If there are any bugs for pushover.net notify, please report here: https://github.com/Neilpang/acme.sh/issues/2329
 
-## 7. Set notification for IFTTT Webhooks
+## 8. Set notification for IFTTT Webhooks
 
 Send notification via IFTTT Webhooks so that you can make acme.sh work with tons of [IFTTT](https://ifttt.com) services.
 
@@ -244,7 +262,7 @@ The `IFTTT_API_KEY`, `IFTTT_EVENT_NAME`, `IFTTT_SUBJECT_KEY` and `IFTTT_CONTENT_
 If there are any bugs for IFTTT Webhooks notify, please report here: https://github.com/Neilpang/acme.sh/issues/2421
 
 
-## 8. Set notification for xmpp (aka jabber)
+## 9. Set notification for xmpp (aka jabber)
 
 Install `sendxmpp` manually or using your distributions package manager. Configure the sending account in `~/.sendxmpprc` e.g.:
 
@@ -280,7 +298,7 @@ The `XMPP_TO`, `XMPP_BIN` and `XMPP_BIN_ARGS` will be saved in ~/.acme.sh/accoun
 On debian based systems `sendxmpp` has problems validating certificates (see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854210).
 
 
-## 9. Set notification for dingtalk.com(钉钉)
+## 10. Set notification for dingtalk.com(钉钉)
 
 Push notification to dingtalk group by group robot webhook api.
 First create a group robot, get your webhook url, and set a keyword.
@@ -298,7 +316,7 @@ acme.sh  --set-notify  --notify-hook dingtalk
 
 ```
 
-## 10. Set notification for QQ with self-built CQHTTP API
+## 11. Set notification for QQ with self-built CQHTTP API
 
 ### 中文说明
 通过 CoolQ 的插件 CQHTTP 将消息推送到 QQ。需要您自行部署 CQHTTP 服务端。部署详情参见 [CoolQ 社区](https://cqp.cc)和 [CQHTTP](https://cqhttp.cc) 的文档。
@@ -597,4 +615,4 @@ message="$2"
 status="$3"
 
 do-something "$subject ($status): $message"
-```
\ No newline at end of file
+```