diff --git a/src/inverse-stereographic-projection.py b/src/inverse-stereographic-projection.py
index 1cb2b25f74225bb9fa50a58d25dff2f1466d4218..703ffa714de07e274fc1cebe6d0aa3786e3cda1c 100644
--- a/src/inverse-stereographic-projection.py
+++ b/src/inverse-stereographic-projection.py
@@ -2,6 +2,9 @@
 def f(x):
     normSquared = x[0]*x[0]+x[1]*x[1]
     return [2*x[0] / (normSquared+1), 2*x[1] / (normSquared+1), (normSquared-1)/ (normSquared+1)]
+    #a = 20
+    #normSquared = a*a*(x[0]*x[0]+x[1]*x[1])
+    #return [a*2*x[0] / (normSquared+1), a*2*x[1] / (normSquared+1), (normSquared-1)/ (normSquared+1)]
 
 def df(x):
     normSquared = x[0]*x[0]+x[1]*x[1]