diff --git a/docs/ecolyo/functionalities/challenge.md b/docs/ecolyo/functionalities/challenge.md
index 709371edad2d72de7ab0da1bb494372183813da4..243a255884e56c0d39302eca43e683be9087188e 100644
--- a/docs/ecolyo/functionalities/challenge.md
+++ b/docs/ecolyo/functionalities/challenge.md
@@ -68,7 +68,10 @@ If the thresold is reached and no valid period was found, we alert the user that
 ### On going
 
 Every time the user go into the duel mode, we are checking if the duel is finished.
-if (actualDate - startDate) > duelDuration, the duel is done.
+if we have retrieve all data to calculate the user consumption on the duel duration, the duel is done
+
+!!! info "In order to not block the user is a value is mising, we are also set the duel as done when we reach the startDate + delay in day to retrieve the data (based on the fluid) + 1 day. In this case the user consumption is done on known values."
+
 
 ### On finish