diff --git a/internal/readpassword/trezor.go b/internal/readpassword/trezor.go
index c0cc450..ab35005 100644
--- a/internal/readpassword/trezor.go
+++ b/internal/readpassword/trezor.go
@@ -1,6 +1,7 @@
 package readpassword

 import (
+	"fmt"
 	"os"

 	"github.com/rfjakob/gocryptfs/internal/exitcodes"
@@ -50,6 +51,10 @@ func Trezor() []byte {
 	}
 	if len(trezors) > 1 {
 		tlog.Fatal.Printf("It's more than one Trezor device connected. This case is not implemented, yet. The number of currently connected devices: %v.", len(trezors))
+		fmt.Printf("trezors=%#v\n", trezors)
+		for i, v := range trezors {
+			fmt.Printf("trezors[%d]=%#v\n", i, v)
+		}
 		os.Exit(exitcodes.TrezorError)
 	}