diff --git a/cmd/version.go b/cmd/version.go
index 6a304dc..717cedf 100644
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -1,3 +1,4 @@
+// Package cmd is a root command.
 /*
 Copyright © 2023 Takafumi Miyanaga <miya.org.0309@gmail.com>
 
@@ -23,6 +24,7 @@ package cmd
 
 import "fmt"
 
+// Version is a version of this application.
 const Version = "0.0.1"
 
 // SetVersionInfo sets version and date to rootCmd
diff --git a/go.mod b/go.mod
index ba9feeb..43dde28 100644
--- a/go.mod
+++ b/go.mod
@@ -2,8 +2,9 @@ module github.com/orangekame3/cobra-template
 
 go 1.21.0
 
+require github.com/spf13/cobra v1.7.0
+
 require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/spf13/cobra v1.7.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 )