diff --git a/rpi/services/clock_service.py b/rpi/services/clock_service.py
index d1f9b016..801557da 100644
--- a/rpi/services/clock_service.py
+++ b/rpi/services/clock_service.py
@@ -45,7 +45,10 @@ class ClockService:
         return clock
 
     def __tick(self, formatted_time : str) -> None:
-        self.__update_screen(formatted_time)
+        if self.white_clock.is_running() :
+            self.__update_screen(f"W {formatted_time} \n B {self.black_clock.clock_to_str()}")
+        elif self.black_clock.is_running() :
+            self.__update_screen(f"W {self.white_clock.clock_to_str()} \n B {formatted_time}")
 
     def __terminate(self) -> None:
         self.__update_screen("Time is over !")