diff --git a/Makefile b/Makefile
index f2e6996c..2fb1264d 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,7 @@ bundle-test:
 
 test:
 	@echo to be implemented
+	@echo Open test/index.html instead
 
 documentation:
 	@jsdoc src -r -d doc