diff --git a/prometheus/example_clustermanager_test.go b/prometheus/example_clustermanager_test.go
index 4cafa55..92b61ca 100644
--- a/prometheus/example_clustermanager_test.go
+++ b/prometheus/example_clustermanager_test.go
@@ -131,7 +131,7 @@ func ExampleCollector() {
 	NewClusterManager("db", reg)
 	NewClusterManager("ca", reg)
 
-	// Add the built in process and golang metrics to this registry
+	// Add the standard process and Go metrics to the custom registry.
 	reg.MustRegister(
 		prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}),
 		prometheus.NewGoCollector(),