diff --git a/src/arenas/Battleship/js.js b/src/arenas/Battleship/js.js
index 98a62fb..6d52143 100644
--- a/src/arenas/Battleship/js.js
+++ b/src/arenas/Battleship/js.js
@@ -24,7 +24,7 @@ function battleship(bot1,bot2,gridWidth,gridHeight,nbShip1,nbShip2,nbShip3,nbShi
   
   var shipsArea= nbShip1 + 2 * nbShip2 + 3 * nbShip3 + 4 * nbShip4 + 5 * nbShip5 + 6 * nbShip6;
   if(shipsArea > parseInt(gridWidth * gridHeight / 2) ){
-      alert("Map is too small. Sum of ships areas must be under 50% of the map." + shipsArea);
+      alert("Map is too small. Sum of ships areas must be under 50% of the map." + shipsArea + " " + parseInt(gridWidth * gridHeight / 2));
       return;
   }
   var ships= [0,nbShip1,nbShip2,nbShip3,nbShip4,nbShip5,nbShip6];