diff --git a/docs/en/hat/hat-ncir.md b/docs/en/hat/hat-ncir.md
index e8b7ba9d..6c87179e 100644
--- a/docs/en/hat/hat-ncir.md
+++ b/docs/en/hat/hat-ncir.md
@@ -35,8 +35,8 @@ Connect with M5StickC via GOIO 0/26 (I2C add: 0x5A).<br>
 ### Pin Map
 
 <table>
- <tr><td>M5StickC</td><td>GPIO0</td><td>GPIO26</td><td>5V</td><td>GND</td></tr>
- <tr><td>HAT NCIR</td><td>SDA</td><td>SCL</td><td>5V</td><td>GND</td></tr>
+ <tr><td>M5StickC</td><td>GPIO0</td><td>GPIO26</td><td>3.3V</td><td>GND</td></tr>
+ <tr><td>HAT NCIR</td><td>SDA</td><td>SCL</td><td>3.3V</td><td>GND</td></tr>
 </table>
 
 ## Schematic