diff --git a/polytop_examples/dendrimer_ethylamine.py b/polytop_examples/dendrimer_ethylamine.py
old mode 100644
new mode 100755
index 4a0d200..620198e
--- a/polytop_examples/dendrimer_ethylamine.py
+++ b/polytop_examples/dendrimer_ethylamine.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 # Construction of an ethylamine dendrimer
 
 # Import required Classes from PolyTop
diff --git a/polytop_examples/linear_PEI.py b/polytop_examples/linear_PEI.py
old mode 100644
new mode 100755
index 0a24f28..db0ddd7
--- a/polytop_examples/linear_PEI.py
+++ b/polytop_examples/linear_PEI.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 # Construction of a simple linear homopolymer of PEI
 
 # This polymer will be 20 monomers long and constructed by joining Atom N71 to
diff --git a/polytop_examples/star_PEG.py b/polytop_examples/star_PEG.py
old mode 100644
new mode 100755
index 86ed8d7..47dd736
--- a/polytop_examples/star_PEG.py
+++ b/polytop_examples/star_PEG.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 # Construction of a 4-arm PEG star polymer from single monomeric units
 
 # Import required Classes from PolyTop