From 6a9e1e7b06ed8e7faf6974933f605d6c3fe69481 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Wed, 12 Feb 2020 20:30:51 +0800
Subject: [PATCH] add simple doc

---
 src/experimental/tf_y_twist.scad | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/experimental/tf_y_twist.scad b/src/experimental/tf_y_twist.scad
index 78aad883..0218c9ce 100644
--- a/src/experimental/tf_y_twist.scad
+++ b/src/experimental/tf_y_twist.scad
@@ -1,5 +1,10 @@
 use <rotate_p.scad>;
 
+/*
+    size: The size of a rectangle.
+    point: A point in the rectangle.
+    angle: twisted angle.
+*/
 function tf_y_twist(size, point, angle) =
     let(
         xlen = size[0],