diff --git a/log.go b/log.go
index 1376a13..4438edc 100644
--- a/log.go
+++ b/log.go
@@ -73,7 +73,7 @@ type Ldata struct {
 	Color bool
 }
 
-type logger struct {
+type Logger struct {
 	system string
 	color  bool
 
@@ -88,8 +88,8 @@ type logger struct {
 	info_tmpl  *template.Template
 }
 
-func Default() *logger {
-	l := &logger{
+func Default() *Logger {
+	l := &Logger{
 		err:       os.Stderr,
 		out:       os.Stdout,
 		color:     true,
@@ -99,8 +99,8 @@ func Default() *logger {
 	return l
 }
 
-func (l *logger) Sub(sys string) *logger {
-	ret := &logger{
+func (l *Logger) Sub(sys string) *Logger {
+	ret := &Logger{
 		system:    sys,
 		err:       l.err,
 		out:       l.out,
@@ -115,7 +115,7 @@ func (l *logger) Sub(sys string) *logger {
 	return ret
 }
 
-func (l *logger) guessColor() {
+func (l *Logger) guessColor() {
 	l.color = true
 	if w, ok := l.out.(*os.File); !ok || os.Getenv("TERM") == "dumb" ||
 		(!isatty.IsTerminal(w.Fd()) && !isatty.IsCygwinTerminal(w.Fd())) {
@@ -126,19 +126,19 @@ func (l *logger) guessColor() {
 		l.color = false
 	}
 }
-func (l *logger) SetColor(c bool) {
+func (l *Logger) SetColor(c bool) {
 	l.color = c
 }
 
-func (l *logger) SetErrOutput(err io.Writer) {
+func (l *Logger) SetErrOutput(err io.Writer) {
 	l.err = err
 }
 
-func (l *logger) SetOutput(out io.Writer) {
+func (l *Logger) SetOutput(out io.Writer) {
 	l.out = out
 }
 
-func (l *logger) Reload() error {
+func (l *Logger) Reload() error {
 	l.guessColor()
 	return l.ParseTmpl()
 }
@@ -152,7 +152,7 @@ func NewLogFormater() *LogFormater {
 	}
 }
 
-func (l *logger) DefaultFuncMap() template.FuncMap {
+func (l *Logger) DefaultFuncMap() template.FuncMap {
 	funcMap := template.FuncMap{
 		"Time": func() string { return time.Now().Format("2006/01/02 15:04:05") },
 	}
@@ -160,7 +160,7 @@ func (l *logger) DefaultFuncMap() template.FuncMap {
 	return funcMap
 }
 
-func (l *logger) ParseTmpl() error {
+func (l *Logger) ParseTmpl() error {
 	if l.funcMap == nil {
 		l.funcMap = l.DefaultFuncMap()
 	}
@@ -187,14 +187,14 @@ func (l *logger) ParseTmpl() error {
 	return nil
 }
 
-func (l *logger) SetTmpl(formatter *LogFormater, funcMap template.FuncMap) {
+func (l *Logger) SetTmpl(formatter *LogFormater, funcMap template.FuncMap) {
 	l.formatter = formatter
 	if funcMap != nil {
 		l.funcMap = funcMap
 	}
 }
 
-func (l *logger) output(t tout, depth int, stack string, fields H, v ...interface{}) {
+func (l *Logger) output(t tout, depth int, stack string, fields H, v ...interface{}) {
 	msg := fmt.Sprint(v...)
 	data := Ldata{
 		Fields:  fields,
@@ -228,12 +228,12 @@ func (l *logger) output(t tout, depth int, stack string, fields H, v ...interfac
 		err = l.info_tmpl.Execute(l.out, data)
 	}
 	if err != nil {
-		fmt.Fprintln(l.err, "[FATAL] logger error:", err)
+		fmt.Fprintln(l.err, "[FATAL] Logger error:", err)
 		panic(err)
 	}
 }
 
-func (l *logger) ErrorF(fields H, v ...interface{}) {
+func (l *Logger) ErrorF(fields H, v ...interface{}) {
 	if PROD {
 		l.output(terror, 3, "", fields, v...)
 	} else {
@@ -241,7 +241,7 @@ func (l *logger) ErrorF(fields H, v ...interface{}) {
 	}
 }
 
-func (l *logger) Error(v ...interface{}) {
+func (l *Logger) Error(v ...interface{}) {
 	if PROD {
 		l.output(terror, 3, "", H{}, v...)
 	} else {
@@ -249,7 +249,7 @@ func (l *logger) Error(v ...interface{}) {
 	}
 }
 
-func (l *logger) DebugF(fields H, v ...interface{}) {
+func (l *Logger) DebugF(fields H, v ...interface{}) {
 	if PROD {
 		l.output(tdebug, 3, "", fields, v...)
 	} else {
@@ -257,7 +257,7 @@ func (l *logger) DebugF(fields H, v ...interface{}) {
 	}
 }
 
-func (l *logger) Debug(v ...interface{}) {
+func (l *Logger) Debug(v ...interface{}) {
 	if PROD {
 		l.output(tdebug, 3, "", H{}, v...)
 	} else {
@@ -265,18 +265,18 @@ func (l *logger) Debug(v ...interface{}) {
 	}
 }
 
-func (l *logger) WarnF(fields H, v ...interface{}) {
+func (l *Logger) WarnF(fields H, v ...interface{}) {
 	l.output(twarn, 3, "", fields, v...)
 }
 
-func (l *logger) Warn(v ...interface{}) {
+func (l *Logger) Warn(v ...interface{}) {
 	l.output(twarn, 3, "", H{}, v...)
 }
 
-func (l *logger) InfoF(fields H, v ...interface{}) {
+func (l *Logger) InfoF(fields H, v ...interface{}) {
 	l.output(tinfo, 3, "", fields, v...)
 }
 
-func (l *logger) Info(v ...interface{}) {
+func (l *Logger) Info(v ...interface{}) {
 	l.output(tinfo, 3, "", H{}, v...)
 }
diff --git a/std.go b/std.go
index 68e836b..9631b95 100644
--- a/std.go
+++ b/std.go
@@ -2,7 +2,7 @@ package log
 
 var std = Default()
 
-func Sub(sys string) *logger {
+func Sub(sys string) *Logger {
 	return std.Sub(sys)
 }