diff --git a/main.py b/main.py
index 32e19d8..0f12299 100644
--- a/main.py
+++ b/main.py
@@ -16,6 +16,8 @@ def main():
 
     screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
 
+    time = pygame.time.Clock()
+    dt = 0
 
     while True:
         for event in pygame.event.get():
@@ -23,8 +25,9 @@ def main():
                 return
 
         pygame.Surface.fill(screen, (0,0,0))
+        pygame.display.flip() #refresh screen
 
-        pygame.display.flip() #this is the last in loop | refresh screen
+        dt = time.tick(60) / 1000 #conveted to ms
 
 if __name__ == "__main__":
     main()