diff --git a/pyshoot.py b/pyshoot.py
index 698c26d..e03f311 100755
--- a/pyshoot.py
+++ b/pyshoot.py
@@ -83,10 +83,22 @@ class Bullet(Object):
 	def __init__(self, frames, type, pos):
 		Object.__init__(self, frames, pos, (0, 0))
 		self.type = type
+	
+	def update(self):
+		# destroy when collide or when exists the screen
+		if self.in_screen():
+			self.rect.move_ip(self.speed)
+		else:
+			globals.bullets_list.remove(self)
+			
+	def in_screen(self):
+		""" detect if bullet is in the screen """
+		return self.rect.colliderect(globals.screen.get_rect())
 
 class Player(Object):
 	def __init__(self, frames, pos, speed):
 		Object.__init__(self, frames, pos, speed)
+		self.shooting = False
 		
 	def shoot(self):
 		""" create a bullet and add it to the global bullet list"""
@@ -106,10 +118,15 @@ class Player(Object):
 			globals.moving_objects.remove(self)
 
 	def start_shoot(self):
-		self.shoot()
+		self.shooting = True
 
 	def stop_shoot(self):
-		pass
+		self.shooting = False
+	
+	def update(self):
+		self.rect.move_ip(self.speed)
+		if self.shooting:
+			self.shoot()
 
 def init_gfx():
 	"""graphics initialisation"""