diff --git a/doc/api/cluster.md b/doc/api/cluster.md
index 15ffb239ed3dd9..50677f62ec5d8e 100644
--- a/doc/api/cluster.md
+++ b/doc/api/cluster.md
@@ -198,8 +198,8 @@ Within a worker, `process.on('message')` may also be used.
 
 See [`process` event: `'message'`][].
 
-As an example, here is a cluster that keeps count of the number of requests
-in the master process using the message system:
+Here is an example using the message system. It keeps a count in the master
+process of the number of HTTP requests received by the workers:
 
 ```js
 const cluster = require('cluster');