diff --git a/yu_scratch.md b/yu_scratch.md
index ef7740f..d0a062c 100644
--- a/yu_scratch.md
+++ b/yu_scratch.md
@@ -18,8 +18,8 @@ Working on: Application 2 centre de mesures sensor oximeter 2.
 - Possibilité de forcer une acquisition. Ce forcement démarre le cycle de mesure.
 
 ### To-do list for being able to read measurements from the oximeter 2
-[] Implement an i2c library for lpc55s16
-[] Use the implemented i2c library to communication between lpc55s16 and Oximeter 2.
+[x] Implement an i2c library for lpc55s16
+[ ] Use the implemented i2c library to communication between lpc55s16 and Oximeter 2.
 
 ## LPC55S16-EVK setup
 The I2C interface of the codec is routed to Flexcomm 4 of the LPC55Sxx, the same connection as used for the other I2C devices on the board. (from "LPCXpresso55S16 Development Boards User Manual")