diff --git a/tests.mk b/tests.mk
index 217f6ffb6..8c790360a 100644
--- a/tests.mk
+++ b/tests.mk
@@ -104,12 +104,15 @@ deploy-tests:
 	@$(QUIET) $(MAKE) deploy-test-gitsubmodules
 	@$(QUIET) $(MAKE) deploy-test-go
 	@$(QUIET) $(MAKE) deploy-test-java
-	# broken with new buildstep
+	# broken with new buildstep.
+	# ref: https://github.com/progrium/dokku/issues/832
+	# ref: https://github.com/heroku/heroku-buildpack-ruby/pull/319
 	# @$(QUIET) $(MAKE) deploy-test-multi
 	@$(QUIET) $(MAKE) deploy-test-nodejs-express
 	@$(QUIET) $(MAKE) deploy-test-php
 	@$(QUIET) $(MAKE) deploy-test-python-flask
 	# fails on apt-get update... ref: https://github.com/progrium/buildpack-nginx/issues/18
+	# https://github.com/progrium/buildpack-nginx/issues/18
 	# @$(QUIET) $(MAKE) deploy-test-static
 
 test: setup-deploy-tests lint unit-tests deploy-tests