diff --git a/README.md b/README.md
index a0439dd9..a4ba5adb 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ This is a library for our Monochrome OLEDs based on SSD1306 drivers
   Pick one up today in the adafruit shop!
   ------> http://www.adafruit.com/category/63_98
 
-These displays use I2C or SPI to communicate, 2 to 5 pins are required to interface.
+These displays use I2C or SPI to communicate, 2 to 5 pins are required to interface. Arduinos have dedicated I2C-pins that are used by the Wire-Library. Like A4(SDA), A5(SCL) on a UNO or 20(SDA), 21(SCL) on a MEGA 2560. Look out for the I2C-pins of your board. 
 
 Adafruit invests time and resources providing this open source code,
 please support Adafruit and open-source hardware by purchasing
diff --git a/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino b/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino
index 03497858..cd949b3b 100644
--- a/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino
+++ b/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino
@@ -27,6 +27,10 @@
 #define SCREEN_HEIGHT 32 // OLED display height, in pixels
 
 // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+// The pins for I2C are fixed and defined by the Wire-library. 
+// On an arduino UNO it's: A4(SDA), A5(SCL)
+// On an arduino DUE or a MEGA2560 it's: 20(SDA), 21(SCL)
+// On an arduino LEONARDO it's: 2(SDA), 3(SCL), ...
 #define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
 
diff --git a/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino b/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino
index 812bac0b..e0e13c93 100644
--- a/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino
+++ b/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino
@@ -27,6 +27,10 @@
 #define SCREEN_HEIGHT 64 // OLED display height, in pixels
 
 // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+// The pins for I2C are fixed and defined by the Wire-library. 
+// On an arduino UNO it's: A4(SDA), A5(SCL)
+// On an arduino DUE or a MEGA2560 it's: 20(SDA), 21(SCL)
+// On an arduino LEONARDO it's: 2(SDA), 3(SCL), ...
 #define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);