diff --git a/src/pixel/px_sphere.scad b/src/pixel/px_sphere.scad
index f65abc57..9ff7d83d 100644
--- a/src/pixel/px_sphere.scad
+++ b/src/pixel/px_sphere.scad
@@ -1,3 +1,14 @@
+/**
+* px_sphere.scad
+*
+* @copyright Justin Lin, 2019
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2-px_sphere.html
+*
+**/ 
+
+
 function px_sphere(radius, filled = false, thickness = 1) = 
     let(range = [-radius: radius - 1])
     filled ? [