diff --git a/cmd/mavweb/main.go b/cmd/mavweb/main.go
index 0d41585..cf6109d 100644
--- a/cmd/mavweb/main.go
+++ b/cmd/mavweb/main.go
@@ -314,7 +314,7 @@ func noCache(h http.Handler) http.Handler {
 }
 
 func main() {
-	addr := flag.String("addr", ":9200", "HTTP listen address")
+	addr := flag.String("addr", "127.0.0.1:9200", "HTTP listen address (loopback by default; pass e.g. \":9200\" or a LAN IP deliberately for wider exposure — POST /chat and /routines are state-changing)")
 	voiceAddr := flag.String("voice", "127.0.0.1:9100", "voice server TCP addr (host:port)")
 	// ntfyWS: the ntfy WebSocket subscribe URL the PWA connects to for in-app
 	// nudge delivery, e.g. wss://ntfy.kvmx.ru/maven/ws?auth=<base64-token>. The