diff --git a/README.md b/README.md
index 80f450d..247f40f 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ You have to short-circuit `R0` on the RS485 boards to enable the termination res
 | ---- | -------------- |
 | GND  | GND to others  |
 | 3,5V | VIN on RS485   |
-| 5V   | VIN on W5500   |
+| 3,3V | VIN on W5500   |
 | 0    | Onboard Button |
 | 5    | Ext. Button    |
 | 7    | Ext. LED       |