From 654ec5000ca863972e4a34fcdaf1e5ab02187d71 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Sat, 15 Feb 2020 19:51:27 +0800
Subject: [PATCH] add simple doc

---
 src/experimental/tf_torus.scad | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/experimental/tf_torus.scad b/src/experimental/tf_torus.scad
index c22403dc..ea2ac6ba 100644
--- a/src/experimental/tf_torus.scad
+++ b/src/experimental/tf_torus.scad
@@ -1,5 +1,12 @@
 use <rotate_p.scad>;
 
+/*
+    size: The size of a rectangle.
+    point: A point in the rectangle.
+    radius: torus [R, r]
+    angle: torus [A, a].
+    twist: The number of degrees of through which the rectangle is twisted.
+*/
 function tf_torus(size, point, radius, angle = [360, 360], twist = 0) =
     let(
         xlen = size[0],