From ed6ddec02ccdf1c966cd6dce9ae824026741ca7f Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Sat, 29 Jun 2019 18:18:11 +0800
Subject: [PATCH] update doc

---
 docs/lib-arc.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/lib-arc.md b/docs/lib-arc.md
index 0c3a9d4c..6e3611dd 100644
--- a/docs/lib-arc.md
+++ b/docs/lib-arc.md
@@ -6,6 +6,7 @@ Creates an arc. You can pass a 2 element vector to define the central angle. Its
 
 - `radius` : The radius of the circle.
 - `angle` : A single value or a 2 element vector which defines the central angle. The first element of the vector is the beginning angle in degrees, and the second element is the ending angle.
+- `width` : The width of the arc.
 - `width_mode` : The default value is `"LINE_CROSS"`. The arc line will move outward by `width / 2` and inward by `width / 2`. If it's `"LINE_OUTWARD"`, The arc line moves outward by `width`. The `"LINE_INWARD"` moves the arc line inward by `width`.
 - `$fa`, `$fs`, `$fn` : Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details.