diff --git a/README.md b/README.md
index c9188a7af..18f25a682 100755
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 [![](https://img.shields.io/docker/pulls/ossrs/srs)](https://hub.docker.com/r/ossrs/srs/tags)
 [![](https://ossrs.net/wiki/images/do-btn-srs-125x20.svg)](https://cloud.digitalocean.com/droplets/new?appId=104916642&size=s-1vcpu-1gb&region=sgp1&image=ossrs-srs&type=applications)
 
-SRS/5.0(Bee) is a simple, high efficiency and realtime video server, supports RTMP/WebRTC/HLS/HTTP-FLV/SRT.
+SRS/5.0(Bee) is a simple, high efficiency and realtime video server, supports RTMP/WebRTC/HLS/HTTP-FLV/SRT/GB28181.
 
 [![SRS Overview](https://ossrs.net/wiki/images/SRS-SingleNode-4.0-sd.png?v=114)](https://ossrs.net/wiki/images/SRS-SingleNode-4.0-hd.png)
 
diff --git a/trunk/doc/Features.md b/trunk/doc/Features.md
index 9f36d9c2c..0d7df869c 100644
--- a/trunk/doc/Features.md
+++ b/trunk/doc/Features.md
@@ -22,6 +22,7 @@ The features of SRS.
 - [x] API: Support HTTP API([CN](https://ossrs.net/lts/zh-cn/docs/v4/doc/http-api), [EN](https://ossrs.io/lts/en-us/docs/v4/doc/http-api)) for system management.
 - [x] API: Support HTTP callback([CN](https://ossrs.net/lts/zh-cn/docs/v4/doc/http-callback), [EN](https://ossrs.io/lts/en-us/docs/v4/doc/http-callback)) for authentication and integration.
 - [x] API: Support reuse HTTP Stream port for HTTP API, [#2881](https://github.com/ossrs/srs/issues/2881).
+- [x] API: [Experimental] Support Prometheus exporter, [#2899](https://github.com/ossrs/srs/issues/2899).
 - [x] Live: Support Edge Cluster for live streaming, see ([CN](https://ossrs.net/lts/zh-cn/docs/v4/doc/edge), [EN](https://ossrs.io/lts/en-us/docs/v4/doc/edge)).
 - [x] Live: Support Origin server for converting RTMP to HTTP-FLV([CN](https://ossrs.net/lts/zh-cn/docs/v4/doc/sample-http-flv), [EN](https://ossrs.io/lts/en-us/docs/v4/doc/sample-http-flv)) and HLS([CN](https://ossrs.net/lts/zh-cn/docs/v4/doc/delivery-hls), [EN](https://ossrs.io/lts/en-us/docs/v4/doc/delivery-hls)).
 - [x] Live: Support Edge server for converting RTMP to HTTP-FLV([CN](https://ossrs.net/lts/zh-cn/docs/v4/doc/sample-http-flv), [EN](https://ossrs.io/lts/en-us/docs/v4/doc/sample-http-flv)).