diff --git a/src/pkg/testing/testing.go b/src/pkg/testing/testing.go
index fddd295cb6f..66d26b8ad8e 100644
--- a/src/pkg/testing/testing.go
+++ b/src/pkg/testing/testing.go
@@ -14,6 +14,9 @@
 //     func BenchmarkXxx(*testing.B)
 // are considered benchmarks, and are executed by the "go test" command when
 // the -test.bench flag is provided. Benchmarks are run sequentially.
+// 
+// For a description of the testing flags, see
+// http://golang.org/cmd/go/#Description_of_testing_flags.
 //
 // A sample benchmark function looks like this:
 //     func BenchmarkHello(b *testing.B) {