diff --git a/README.md b/README.md
index 52094b5..01e1b16 100644
--- a/README.md
+++ b/README.md
@@ -13,8 +13,8 @@ USB-C connector
 Connections:
 ------------
 
-USB-C D+ <-> Pin4 CH430 chip
-USB-C D- <-> Pin5 CH430 chip
+USB-C D+ <-> Pin5 CH430 chip
+USB-C D- <-> Pin6 CH430 chip
 
 VIN      <-> PWM board (+)
 VIN      <-> USB-C V+
@@ -25,7 +25,7 @@ GND      <-> PWM breakout board GND
 
 D9       <-> PWM Pin of the breakout board
 
-A4       <-> SCL pin of BMP280 breakout board
+A4       <-> SDA pin of BMP280 breakout board
 A5       <-> SDA pin of BMP280 breakout board
 
 PWM board load <-> PC fan (+)