diff --git a/.github/workflows/_docker-image.yaml b/.github/workflows/_docker-image.yaml
index 2f37579b7d..7e600e513b 100644
--- a/.github/workflows/_docker-image.yaml
+++ b/.github/workflows/_docker-image.yaml
@@ -1,4 +1,5 @@
 # !yamlfmt!:ignore
+
 #
 # Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
 #
diff --git a/hack/license/gen/main.go b/hack/license/gen/main.go
index a17f258b66..68f28a86d0 100644
--- a/hack/license/gen/main.go
+++ b/hack/license/gen/main.go
@@ -309,7 +309,9 @@ func readAndRewrite(path string) error {
 			line := sc.Text()
 			if filepath.Ext(path) == ".go" && strings.HasPrefix(line, "//go:") ||
 				filepath.Ext(path) == ".py" && strings.HasPrefix(line, "# -*-") ||
-				filepath.Ext(path) == ".sh" && strings.HasPrefix(line, "#!") {
+				filepath.Ext(path) == ".sh" && strings.HasPrefix(line, "#!") ||
+				filepath.Ext(path) == ".yaml" && strings.HasPrefix(line, "# !") ||
+				filepath.Ext(path) == ".yml" && strings.HasPrefix(line, "# !") {
 				bf = true
 				_, err = buf.WriteString(line)
 				if err != nil {