diff --git a/mozc-piropiro/README.md b/mozc-piropiro/README.md
index 377bed7..7000805 100644
--- a/mozc-piropiro/README.md
+++ b/mozc-piropiro/README.md
@@ -23,11 +23,12 @@ piropiro version.
  Files
 =====================================
 
-* stl/*  -- 3D shape data of mechanical parts
+* arduino/piropiro/piropiro.ino -- firmware source code (Arduino sketch)
+* stl/* -- 3D shape data of mechanical parts
 * README.txt  -- this file
-* circuit.png -- Circuit diagram
-* assembly.png -- Mechanical assembly instruction
-* arduino/piropiro/piropiro.ino -- Firmware source code (Arduino sketch)
+* assembly.png -- mechanical assembly instruction
+* circuit.png -- circuit diagram
+* example.jpg -- photograph of an example device
 
 
  Building your device
@@ -59,6 +60,8 @@ Additionally, you need these parts.
 
 See the circuit diagram and mechanical assembly instruction images.
 
+Also refer the example device in the photo.
+
 ## RN42 module configuration
 
 This step is required for the first time, or when changing the device's name.
@@ -93,18 +96,16 @@ The commands will configure the module as follows:
 * HID flag register = 0 (keyboard)
 
 
-## Electronic Circuit Assembly
+ Using piropiro input
+=====================================
+
+## Power supply
 
-See the circuit diagram for detail.
 When operating the device, supply power by USB cables to both RN-42-EK and
 Arduino Nano. You can alternatively supply 3.3V power to RN-42-EK from Arduino's
 3.3V pin, but this requires a modification on RN-42-EK to disconnect the
 regulator's output pin on it from the circuit.
 
-
- Using piropiro input
-=====================================
-
 ## Sensor adjustment
 
 1. Attach the device to your party horn. The sensor should be positioned about
@@ -113,7 +114,6 @@ regulator's output pin on it from the circuit.
 Arduino board is lit while the sensor is collectly sensing the tip of the
 paper tube between 50mm -- 350mm.
 
-
 ## Bluetooth pairing
 
 Using your device (e.g. Android phone), scan Bluetooth devices and you will
diff --git a/mozc-piropiro/example.jpg b/mozc-piropiro/example.jpg
new file mode 100644
index 0000000..549dcb9
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