diff --git a/examples/pcf8575_blink16outputs.py b/examples/pcf8575_blink16outputs.py
index e8d5e44..acfb671 100644
--- a/examples/pcf8575_blink16outputs.py
+++ b/examples/pcf8575_blink16outputs.py
@@ -8,7 +8,8 @@
 
 print("PCF8575 16 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_pcf8575.PCF8575(i2c)
 
 while True:
diff --git a/examples/pcf8575_buttonled.py b/examples/pcf8575_buttonled.py
index d640eaa..f4ec4c4 100644
--- a/examples/pcf8575_buttonled.py
+++ b/examples/pcf8575_buttonled.py
@@ -9,7 +9,8 @@
 
 print("PCF8575 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_pcf8575.PCF8575(i2c)
 
 # get a 'digitalio' like pin from the pcf
diff --git a/examples/pcf8575_read16inputs.py b/examples/pcf8575_read16inputs.py
index bdfb0c9..c211675 100644
--- a/examples/pcf8575_read16inputs.py
+++ b/examples/pcf8575_read16inputs.py
@@ -8,7 +8,8 @@
 
 print("PCF8575 16 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_pcf8575.PCF8575(i2c)
 
 
diff --git a/examples/pcf8575_simpletest.py b/examples/pcf8575_simpletest.py
index e8226f8..67d96f2 100644
--- a/examples/pcf8575_simpletest.py
+++ b/examples/pcf8575_simpletest.py
@@ -8,7 +8,8 @@
 
 print("PCF8575 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_pcf8575.PCF8575(i2c)
 
 # get a 'digitalio' like pin from the pcf