diff --git a/Makefile b/Makefile
index b772f59..e7bff69 100644
--- a/Makefile
+++ b/Makefile
@@ -93,6 +93,7 @@ coverage: test
 
 coverage/html: coverage.out
 	$(GOCOVER) -html=coverage.out -o ./coverage/coverage.html
+	open ./coverage/coverage.html
 
 outdated:
 	$(GO) list -m -u all