diff --git a/Makefile b/Makefile
index 4bab277..4f844f4 100644
--- a/Makefile
+++ b/Makefile
@@ -8,4 +8,4 @@ test:
 coverage:
 	[[ -d coverage ]] || mkdir coverage
 	go test -coverpkg=./... -coverprofile=coverage/index.out  ./...
-	go tool cover -html=coverage/index.out
+	go tool cover -html=coverage/index.out -o coverage/index.html