diff --git a/examples/gameplay/plateform/actors/player.lua b/examples/gameplay/plateform/actors/player.lua
index 862bba9..e5966a0 100644
--- a/examples/gameplay/plateform/actors/player.lua
+++ b/examples/gameplay/plateform/actors/player.lua
@@ -10,8 +10,8 @@ end
 function Player:update(dt)
   self.xfrc = 480*3
 
-  if self.keys["up"].isDown then
-    --self.ysp = -120
+  if self.keys["up"].isPressed and (self.onGround) then
+    self.ysp = -280
   end
   if self.keys["down"].isDown then
     --self.ysp =  120