diff --git a/doc/metrics.md b/doc/metrics.md
index 14676aacf7..826d8348f4 100644
--- a/doc/metrics.md
+++ b/doc/metrics.md
@@ -42,7 +42,8 @@ npm install fastify @opentelemetry/sdk-node @opentelemetry/exporter-prometheus @
 
 The `@opentelemetry/sdk-node` and `@opentelemetry/auto-instrumentations-node` will install allt he
 necessary packages to start with Opentelemetry including instrumentation for a wide variety of popular
-packages, such as `http`, `fetch` etc.
+packages, such as `http`, `fetch` etc. The package `@opentelemetry/exporter-prometheus` is installed
+to export our measured metrics in the Prometheus format as popular approach to expose metrics.
 
 ### Create the sample HTTP Server
 Create a file `app.js`: