From 701bbb47e9126b91f9714d482e1380441d53cd34 Mon Sep 17 00:00:00 2001
From: Justin Lin <justin.sdk@gmail.com>
Date: Wed, 30 Jun 2021 17:57:05 +0800
Subject: [PATCH] update doc

---
 docs/lib3x-sf_thickenT.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/lib3x-sf_thickenT.md b/docs/lib3x-sf_thickenT.md
index 926b7a80..f9538912 100644
--- a/docs/lib3x-sf_thickenT.md
+++ b/docs/lib3x-sf_thickenT.md
@@ -40,12 +40,12 @@ It thickens a surface with triangular mesh.
 	use <surface/sf_thickenT.scad>;
 
 	u_step = 10;
-	r_step = 0.2;
+	v_step = 0.2;
 	thickness = .2;
 
 	points = [
 		for(u = [0:u_step:360])
-			for(v = [-1:r_step:1])
+			for(v = [-1:v_step:1])
 			let(
 				x = (1 + v / 2 * cos(u / 2)) * cos(u),
 				y = (1 + v / 2 * cos(u / 2)) * sin(u),
@@ -56,7 +56,7 @@ It thickens a surface with triangular mesh.
 
 	triangles = tri_delaunay([
 		for(u = [0:u_step:360])
-			for(v = [-1:r_step:1])
+			for(v = [-1:v_step:1])
 			[v, u]
 	]);