diff --git a/polar-plot.py b/polar-plot
old mode 100644
new mode 100755
similarity index 96%
rename from polar-plot.py
rename to polar-plot
index 9fd02b6..977d212
--- a/polar-plot.py
+++ b/polar-plot
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# polar_plot.py
+# polar_plot
 #
 # Copyright (C) 2023, Cees Bassa
 # GPLv3+