From 6a07c8ef6d74342afbb396ca525c6e198b07fbe2 Mon Sep 17 00:00:00 2001
From: JianBo He <heeejianbo@163.com>
Date: Wed, 7 Apr 2021 14:27:14 +0800
Subject: [PATCH] chore(extra-plugin): statement plugin tag

---
 lib-extra/README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib-extra/README.md b/lib-extra/README.md
index a2fae3a17..4127b53bc 100644
--- a/lib-extra/README.md
+++ b/lib-extra/README.md
@@ -19,6 +19,15 @@ e.g. For an Erlang plugin named `plugin_foo`:
 }.
 ```
 
+Note: The `-emqx_plugin(?MODULE)` attribute should be added to
+`<plugin-name>_app.erl` file to indicate that this is an EMQ X Broker plugin.
+
+For example:
+```erlang
+%% plugin_foo_app.erl
+-emqx_plugin(?MODULE)
+```
+
 ## Build a release
 
 ```