diff --git a/examples/pcf8574_blink8outputs.py b/examples/pcf8574_blink8outputs.py
index f9c7c67..05a8790 100644
--- a/examples/pcf8574_blink8outputs.py
+++ b/examples/pcf8574_blink8outputs.py
@@ -9,7 +9,8 @@
 
 print("PCF8574 8 output LED blink test")
 
-i2c = board.I2C()
+i2c = board.I2C()  # uses board.SCL and board.SDA
+# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
 pcf = adafruit_pcf8574.PCF8574(i2c)
 
 
diff --git a/examples/pcf8574_buttonled.py b/examples/pcf8574_buttonled.py
index 62dcbd2..fb76772 100644
--- a/examples/pcf8574_buttonled.py
+++ b/examples/pcf8574_buttonled.py
@@ -10,7 +10,8 @@
 
 print("PCF8574 digitalio LED + button test")
 
-i2c = board.I2C()
+i2c = board.I2C()  # uses board.SCL and board.SDA
+# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
 pcf = adafruit_pcf8574.PCF8574(i2c)
 
 # get a 'digitalio' like pin from the pcf
diff --git a/examples/pcf8574_read8inputs.py b/examples/pcf8574_read8inputs.py
index 8e5e5c7..d1fc817 100644
--- a/examples/pcf8574_read8inputs.py
+++ b/examples/pcf8574_read8inputs.py
@@ -9,7 +9,8 @@
 
 print("PCF8574 8 input button test")
 
-i2c = board.I2C()
+i2c = board.I2C()  # uses board.SCL and board.SDA
+# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
 pcf = adafruit_pcf8574.PCF8574(i2c)
 
 
diff --git a/examples/pcf8574_simpletest.py b/examples/pcf8574_simpletest.py
index 3a68c25..d91a049 100644
--- a/examples/pcf8574_simpletest.py
+++ b/examples/pcf8574_simpletest.py
@@ -9,7 +9,8 @@
 
 print("PCF8574 digitalio LED blink test")
 
-i2c = board.I2C()
+i2c = board.I2C()  # uses board.SCL and board.SDA
+# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
 pcf = adafruit_pcf8574.PCF8574(i2c)
 
 # get a 'digitalio' like pin from the pcf