diff --git a/birdie.py b/birdie.py
index ae92853..1c5a7c7 100644
--- a/birdie.py
+++ b/birdie.py
@@ -6,7 +6,10 @@ HEIGHT = 708
 
 def on_mouse_down() :
     if (titi.vivant) :
-        titi.speed = -6.5
+        titi.speed = 6.5
+
+def on_key_down(key) :
+    print(key)
 
 def reset():
     print("Retour au départ...")
@@ -34,6 +37,7 @@ def update():
         reset()
     if titi.colliderect(tube_superieur) or titi.colliderect(tube_inferieur):
         heurte_tube()
+        
 def draw():
     screen.blit('background', (0, 0))
     titi.draw()
@@ -45,7 +49,7 @@ ecart = 140
 tube_superieur = Actor('top')
 tube_inferieur = Actor('bottom')
 vitesse_defilement = 1
-gravite = 0.3
+gravite = -0.3
 reset()
 
 # print(tube_superieur.width, tube_superieur.height)