diff --git a/flags.go b/flags.go
index 7009970..9a54a81 100644
--- a/flags.go
+++ b/flags.go
@@ -120,6 +120,9 @@ func (f *LogFlag) Register() {
 	defer flagsMutex.Unlock()
 	Info("log.Register() ", f)
 	f.Default = f.B
+	if f.Short == "" {
+		f.Short = f.Subsystem
+	}
 	flags = append(flags,f)
 }
 
diff --git a/log.go b/log.go
index 9f07af3..1382816 100644
--- a/log.go
+++ b/log.go
@@ -34,7 +34,7 @@ func Log(x any, a ...any) {
 		if ! f.B {
 			return
 		}
-		a = append([]any{f.Subsystem}, a...)
+		a = append([]any{f.Short}, a...)
 		origlog.Println(a...)
 	default:
 		a = append([]any{x}, a...)