diff --git a/testscript/doc.go b/testscript/doc.go
index 1d23228d..57b3c101 100644
--- a/testscript/doc.go
+++ b/testscript/doc.go
@@ -351,5 +351,7 @@ for manual debugging of failing tests:
 	import "p2"
 	func F() { p2.F() }
 	$
+
+See also: https://pkg.go.dev/github.com/rogpeppe/go-internal/gotooltest
 */
 package testscript