From 67309d8c420302d90bc44d289daa6cc4d9bc673c Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Wed, 26 Apr 2017 13:48:43 +0800
Subject: [PATCH] updated doc

---
 docs/lib-box_extrude.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docs/lib-box_extrude.md b/docs/lib-box_extrude.md
index 28e4d9dc..f4e58716 100644
--- a/docs/lib-box_extrude.md
+++ b/docs/lib-box_extrude.md
@@ -5,7 +5,9 @@ Creates a box (container) from a 2D object.
 ## Parameters
 
 - `height` : The box height.
-- `shell_thickness` : The thickness between the exterior and interior..
+- `shell_thickness` : The thickness between the exterior and interior.
+- `offset_mode` : `"delta"` (default) or `r`. See [offset](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Transformations#offset) for details.
+- `chamfer` : Default `false`. See [offset](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Transformations#offset) for details.
 
 ## Examples