diff --git a/decensor.py b/decensor.py
index 5548659..81bd9a7 100644
--- a/decensor.py
+++ b/decensor.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 try:
     import numpy as np
     from PIL import Image
diff --git a/ui.py b/ui.py
index a665029..158401a 100644
--- a/ui.py
+++ b/ui.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 """
 Code illustration: 6.09
     
@@ -544,4 +546,4 @@ class PaintApplication(framework.Framework):
 if __name__ == '__main__':
     root = tk.Tk()
     app = PaintApplication(root)
-    root.mainloop()
\ No newline at end of file
+    root.mainloop()