diff --git a/source/tool.py b/source/tool.py
index 4bf45be..1a319c8 100644
--- a/source/tool.py
+++ b/source/tool.py
@@ -23,7 +23,7 @@ class State():
         return self.persist
     
     @abstractmethod
-    def update(sefl, surface, keys, current_time):
+    def update(self, surface, keys, current_time):
         '''abstract method'''
 
 class Control():
@@ -173,4 +173,4 @@ SCREEN = pg.display.set_mode(c.SCREEN_SIZE)
 
 GFX = load_all_gfx(os.path.join("resources","graphics"))
 ZOMBIE_RECT = loadZombieImageRect()
-PLANT_RECT = loadPlantImageRect()
\ No newline at end of file
+PLANT_RECT = loadPlantImageRect()