diff --git a/serie1/IT19ta_ZH7_S1_Aufg1.py b/serie1/IT19ta_ZH7_S1_Aufg1.py
index b84583e..8efd428 100755
--- a/serie1/IT19ta_ZH7_S1_Aufg1.py
+++ b/serie1/IT19ta_ZH7_S1_Aufg1.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import numpy
 import matplotlib.pyplot as plt
 
diff --git a/serie1/IT19ta_ZH7_S1_Aufg2.py b/serie1/IT19ta_ZH7_S1_Aufg2.py
index eb4711d..e8b6c1f 100755
--- a/serie1/IT19ta_ZH7_S1_Aufg2.py
+++ b/serie1/IT19ta_ZH7_S1_Aufg2.py
@@ -1,4 +1,4 @@
-
+#!/usr/bin/env python3
 
 if __name__ == "__main__":
     pass
diff --git a/serie1/IT19ta_ZH7_S1_Aufg3.py b/serie1/IT19ta_ZH7_S1_Aufg3.py
index eb4711d..e8b6c1f 100755
--- a/serie1/IT19ta_ZH7_S1_Aufg3.py
+++ b/serie1/IT19ta_ZH7_S1_Aufg3.py
@@ -1,4 +1,4 @@
-
+#!/usr/bin/env python3
 
 if __name__ == "__main__":
     pass