diff --git a/Makefile b/Makefile
index 493c3e3..429415c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
 BINARY_NAME=mdt
 BUILD_DIR=build
 
-.PHONY: all build test coverage clean install
+.PHONY: all build test coverage clean install vet fmt
 
-all: test build
+all: vet test build
 
 build:
 	mkdir -p $(BUILD_DIR)
@@ -16,6 +16,12 @@ coverage:
 	go test -cover -coverprofile=coverage.out ./test/... -coverpkg=./internal/...
 	go tool cover -func=coverage.out
 
+vet:
+	go vet ./...
+
+fmt:
+	go fmt ./...
+
 clean:
 	rm -rf $(BUILD_DIR)
 	rm -f coverage.out
diff --git a/test/ast_test.go b/test/ast_test.go
index 4feb0be..397030b 100644
--- a/test/ast_test.go
+++ b/test/ast_test.go
@@ -10,9 +10,6 @@ func TestASTCoverage(t *testing.T) {
 	pos := parser.Position{Line: 1, Column: 1}
 
 	var n parser.Node
-	// var d parser.Definition // Definition has unexported method, can't assign?
-	// Yes I can assign if I am using the interface type exported by parser.
-	// But I cannot call the method.
 	var d parser.Definition
 	var v parser.Value