diff --git a/arduino/ServoSet/ServoSet.ino b/arduino/ServoSet/ServoSet.ino
index 8b8a880..a905b0d 100644
--- a/arduino/ServoSet/ServoSet.ino
+++ b/arduino/ServoSet/ServoSet.ino
@@ -7,7 +7,7 @@ void setup() {
   servo1.attach(9);
   servo2.attach(10);
   Serial.begin(9600);
-  Serial.print("format : [0-180][ab]");
+  Serial.println("format : [0-180][ab]");
 }
 
 void loop() {
@@ -21,10 +21,14 @@ void loop() {
         v = v * 10 + ch - '0';
         break;
       case 'a':
+        Serial.print("Servo(9) :");
+        Serial.println(v);
         servo1.write(v);
         v = 0;
         break;
       case 'b':
+        Serial.print("Servo(10):");
+        Serial.println(v);
         servo2.write(v);
         v = 0;
         break;