diff --git a/README.en.md b/README.en.md
index 7cb7c17..c5914e5 100644
--- a/README.en.md
+++ b/README.en.md
@@ -11,8 +11,9 @@
 ### 🥇 Features
 
 * Plain and Html form email supports
-* Asynchronous send supports
-* HTTP api supports
+* Synchronous/Asynchronous mode supports, and timeout is available in synchronous mode
+* HTTP api supports, and use http2 is ok
+* Gracefully shutdown with signal mechanism supports
 
 _Check [HISTORY.md](./HISTORY.md) and [FUTURE.md](./FUTURE.md) to know about more information._
 
diff --git a/README.md b/README.md
index 6ac22a1..377032d 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,9 @@
 ### 🥇 功能特性
 
 * 支持发送文本邮件和 HTML 邮件
-* 支持异步邮件发送
-* 支持 http 请求调用接口
+* 支持同步、异步邮件发送，同步模式可配置超时
+* 支持 http 请求调用接口，可配置 http2 协议
+* 支持 signal 通知的平滑下线
 
 _历史版本的特性请查看 [HISTORY.md](./HISTORY.md)。未来版本的新特性和计划请查看 [FUTURE.md](./FUTURE.md)。_