diff --git a/levels.py b/levels.py
index a4c1b5f..a576f8e 100644
--- a/levels.py
+++ b/levels.py
@@ -57,7 +57,7 @@ def open_level(path):
 
 def make_wall(wall_buffer,level):
     if (len(wall_buffer) != 2):
-        print('Warning: wall buffer not contains 2 points.')
+        print("Warning: wall buffer doesn't contains 2 points.")
         return
 
     level.append(