diff --git a/common.go b/common.go
index c7f0c01..3be9c9c 100644
--- a/common.go
+++ b/common.go
@@ -94,12 +94,15 @@ func (fn ClockFn) Now() time.Time {
 	return fn()
 }
 
+// CallerFlagMode Defines the Caller backtrace information mode.
+type CallerFlagMode = uint8
+
 // NOTICE: you must set `Logger.ReportCaller=true` for reporting caller.
 // then config the Logger.CallerFlag by follow flags.
 const (
 	// CallerFlagFnlFcn report short func name with filename and with line.
 	// eg: "logger_test.go:48,TestLogger_ReportCaller"
-	CallerFlagFnlFcn uint8 = iota
+	CallerFlagFnlFcn CallerFlagMode = iota
 	// CallerFlagFull full func name with filename and with line.
 	// eg: "github.com/gookit/slog_test.TestLogger_ReportCaller(),logger_test.go:48"
 	CallerFlagFull
diff --git a/logger.go b/logger.go
index 04a10b2..e456dd1 100644
--- a/logger.go
+++ b/logger.go
@@ -43,7 +43,8 @@ type Logger struct {
 	// ReportCaller on write log record
 	ReportCaller bool
 	CallerSkip   int
-	CallerFlag   uint8
+	// CallerFlag used to set caller traceback information in different modes
+	CallerFlag CallerFlagMode
 	// BackupArgs backup log input args to Record.Args
 	BackupArgs bool
 	// TimeClock custom time clock, timezone