diff --git a/docs/edison.md b/docs/edison.md
index 6263b1f..d37eb4a 100644
--- a/docs/edison.md
+++ b/docs/edison.md
@@ -9,6 +9,7 @@ Currently the Arduino breakout board is supported by libmraa.
 The Edison used with the Arduino board has the following limitations
 in libmraa:
 
+- i2c is exposed on i2c-6, therfore you must use bus 6 and not bus 0
 - PWM avaible on default swizzler postions. (3,5,6,9)
 - SPI exposed is also used for the ADC. Try not to use your own CS.
 - ADC kernel module will return 12bit number but the ADC itself only has an