reference the package layout convention
diff --git a/README.md b/README.md
index 5eae66d..8c7b621 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,9 @@
 
 ## Example
 
+Create a dart file in the [`benchmark/`](https://www.dartlang.org/tools/pub/package-layout#tests-and-benchmarks)
+folder of your package.
+
 ```
 // Import BenchmarkBase class.
 import 'package:benchmark_harness/benchmark_harness.dart';