diff --git a/src/pixel/px_polygon.scad b/src/pixel/px_polygon.scad
index 11bc3bc9..60b04452 100644
--- a/src/pixel/px_polygon.scad
+++ b/src/pixel/px_polygon.scad
@@ -1,3 +1,13 @@
+/**
+* px_polygon.scad
+*
+* @copyright Justin Lin, 2019
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2-px_polygon.html
+*
+**/ 
+
 function px_polygon(points, filled = false) =
     filled ?
     let(