diff --git a/EXAMPLES/C/PCF8591_YL-40/PCF8591.c b/EXAMPLES/C/PCF8591_YL-40/PCF8591.c
index f2c0730..5d9e185 100644
--- a/EXAMPLES/C/PCF8591_YL-40/PCF8591.c
+++ b/EXAMPLES/C/PCF8591_YL-40/PCF8591.c
@@ -16,7 +16,7 @@ sudo ./PCF8591
 */
 
 /*
-Connect Pi 5V - VCC, Ground - Ground, SDA - SDA, SCL - SCL.
+Connect Pi 3V3 - VCC, Ground - Ground, SDA - SDA, SCL - SCL.
 */
 
 #define PCF8591_I2C_ADDR 0x48
diff --git a/EXAMPLES/Python/PCF8591_YL-40/PCF8591.py b/EXAMPLES/Python/PCF8591_YL-40/PCF8591.py
index c2c898c..7ef3110 100755
--- a/EXAMPLES/Python/PCF8591_YL-40/PCF8591.py
+++ b/EXAMPLES/Python/PCF8591_YL-40/PCF8591.py
@@ -10,7 +10,7 @@ import pigpio
 # sudo pigpiod
 # ./PCF8591.py
 
-# Connect Pi 5V - VCC, Ground - Ground, SDA - SDA, SCL - SCL.
+# Connect Pi 3V3 - VCC, Ground - Ground, SDA - SDA, SCL - SCL.
 
 YL_40=0x48