diff --git a/src/runtime/metrics/description_test.go b/src/runtime/metrics/description_test.go
index 448639ee77..fd1fd46efc 100644
--- a/src/runtime/metrics/description_test.go
+++ b/src/runtime/metrics/description_test.go
@@ -43,7 +43,7 @@ func extractMetricDocs(t *testing.T) map[string]string {
 		line := strings.TrimSpace(s.Text())
 		switch state {
 		case stateSearch:
-			if line == "Supported metrics" {
+			if line == "Below is the full list of supported metrics, ordered lexicographically." {
 				state = stateNextMetric
 			}
 		case stateNextMetric:
diff --git a/src/runtime/metrics/doc.go b/src/runtime/metrics/doc.go
index 42b5bc3724..05a887e4f4 100644
--- a/src/runtime/metrics/doc.go
+++ b/src/runtime/metrics/doc.go
@@ -44,6 +44,8 @@ the documentation of the Name field of the Description struct.
 
 Supported metrics
 
+Below is the full list of supported metrics, ordered lexicographically.
+
 	/gc/cycles/automatic:gc-cycles
 		Count of completed GC cycles generated by the Go runtime.