diff --git a/System-Metrics.md b/System-Metrics.md
index 35929d8..2170eb4 100644
--- a/System-Metrics.md
+++ b/System-Metrics.md
@@ -1,4 +1,4 @@
-SeaweedFS publishes metrics to Prometheus Gateway.
+SeaweedFS uses [Prometheus](https://prometheus.io/) to store the metrics and [Grafana](https://grafana.com/grafana) to visualize them. SeaweedFS publishes metrics to [Prometheus Gateway](https://github.com/prometheus/pushgateway), and the gateway pass along to the Prometheus server.
 
 Master | Volume Server | Filer => Prometheus Gateway => Prometheus Server => Grafana
 
@@ -7,9 +7,9 @@ Master | Volume Server | Filer => Prometheus Gateway => Prometheus Server => Gra
 Just add a metrics address to `weed master` or `weed server` command line options. If you have multiple masters, please add it to all the master command line options.
 
 ```
-weed master -metrics.address=localhost:9091
+weed master -metrics.address=<prometheus_gateway_host_name>:<prometheus_gateway_port>
 
-weed server -metrics.address=localhost:9091
+weed server -metrics.address=<prometheus_gateway_host_name>:<prometheus_gateway_port>
 ```
 
 The SeaweedFS filer or volume servers will read this metrics configuration from the master, and report the metrics directly to the Prometheus Gateway.