From 57d46eda8d9b9b06542aceef3d734369195b61ac Mon Sep 17 00:00:00 2001
From: Justin Lin <justin.sdk@gmail.com>
Date: Tue, 12 Oct 2021 16:38:05 +0800
Subject: [PATCH] update README

---
 README.md | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 6a8c02d5..6bb474ca 100644
--- a/README.md
+++ b/README.md
@@ -367,9 +367,10 @@ These examples incubate dotSCAD and dotSCAD refactors these examples. See [examp
 
 ## Transformation
 
-- polyline_join
-[**select**(i)](https://openhome.cc/eGossip/OpenSCAD/lib3x-select.html) | a helper for getting data from a theta-maze cell.
-
+ Signature | Description
+--|--
+[**select**(i)](https://openhome.cc/eGossip/OpenSCAD/lib3x-select.html) | select module objects.
+polyline_join | place a join on each point. Hull each pair of joins and union all convex hulls.
 
 ## Polyhedra