diff --git a/cmd/npc/npc.go b/cmd/npc/npc.go
index 7de5850..45fa226 100644
--- a/cmd/npc/npc.go
+++ b/cmd/npc/npc.go
@@ -32,7 +32,7 @@ var (
 	localType    = flag.String("local_type", "p2p", "p2p target")
 	logPath      = flag.String("log_path", "", "npc log path")
 	debug        = flag.Bool("debug", false, "npc debug")
-	srv          = flag.String("service", "", "npc debug")
+	srv          = flag.String("service", "", "service option")
 )
 
 func main() {
diff --git a/go.mod b/go.mod
index 6677778..18cfc2e 100644
--- a/go.mod
+++ b/go.mod
@@ -15,6 +15,7 @@ require (
 	github.com/klauspost/cpuid v1.2.1 // indirect
 	github.com/klauspost/pgzip v1.2.1 // indirect
 	github.com/klauspost/reedsolomon v1.9.2 // indirect
+	github.com/luisiturrios/gowin v0.0.0-20150312095849-89dcf1aa3c14 // indirect
 	github.com/panjf2000/ants/v2 v2.2.2
 	github.com/pkg/errors v0.8.1
 	github.com/shiena/ansicolor v0.0.0-20151119151921-a422bbe96644 // indirect
diff --git a/go.sum b/go.sum
index 78b5fc7..10b69da 100644
--- a/go.sum
+++ b/go.sum
@@ -61,6 +61,8 @@ github.com/klauspost/pgzip v1.2.1/go.mod h1:Ch1tH69qFZu15pkjo5kYi6mth2Zzwzt50oCQ
 github.com/klauspost/reedsolomon v1.9.2 h1:E9CMS2Pqbv+C7tsrYad4YC9MfhnMVWhMRsTi7U0UB18=
 github.com/klauspost/reedsolomon v1.9.2/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
 github.com/lib/pq v1.0.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/luisiturrios/gowin v0.0.0-20150312095849-89dcf1aa3c14 h1:v2RpRAI7mSnyET19MZUU+3mi8S21HZHk2vBDYp1CClA=
+github.com/luisiturrios/gowin v0.0.0-20150312095849-89dcf1aa3c14/go.mod h1:I2wAi7YNrvMJWpvtZ7MOn1Q7B46zYRQKC8vXZF478z8=
 github.com/mattn/go-sqlite3 v1.10.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
diff --git a/lib/install/install.go b/lib/install/install.go
index 4d769d7..ef07d95 100644
--- a/lib/install/install.go
+++ b/lib/install/install.go
@@ -154,7 +154,7 @@ func CopyDir(srcPath string, destPath string) error {
 			destNewPath := strings.Replace(path, srcPath, destPath, -1)
 			log.Println("copy file ::" + path + " to " + destNewPath)
 			copyFile(path, destNewPath)
-			if !common.IsWindows(){
+			if !common.IsWindows() {
 				chMod(destNewPath, 0766)
 			}
 		}
@@ -210,8 +210,8 @@ func pathExists(path string) (bool, error) {
 	return false, err
 }
 
-func chMod(name string, mode os.FileMode)  {
-	if !common.IsWindows(){
+func chMod(name string, mode os.FileMode) {
+	if !common.IsWindows() {
 		os.Chmod(name, mode)
 	}
 }