From 79d5b7e55233dcd6870914e173f9a8f6dd39ed90 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Tue, 31 Mar 2020 08:40:25 +0800
Subject: [PATCH] add comment

---
 src/surface/sf_square.scad | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/surface/sf_square.scad b/src/surface/sf_square.scad
index d9feb1a2..42d72694 100644
--- a/src/surface/sf_square.scad
+++ b/src/surface/sf_square.scad
@@ -1,3 +1,13 @@
+/**
+* sf_square.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-sf_square.html
+*
+**/ 
+
 use <ptf/ptf_x_twist.scad>;
 use <ptf/ptf_y_twist.scad>;
 use <surface/_impl/_sf_square_surfaces.scad>;