From e5234dd43f22d058909be565bbb02905a1c579f9 Mon Sep 17 00:00:00 2001
From: Bob Yang <bob.yang.dev@gmail.com>
Date: Tue, 8 Sep 2015 14:27:53 +0800
Subject: [PATCH] add readme content

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

diff --git a/README.md b/README.md
index 092904b..900973f 100644
--- a/README.md
+++ b/README.md
@@ -7,4 +7,8 @@ Py3r should have features like:
   - Decent slicing algorithm inspired by Simplify3D
   - Written in Python and C++ or Java (because I like java too)
 
+Some research:
 
+  - [Skeinforge](http://fabmetheus.crsndoo.com/wiki/index.php/Skeinforge) is a slicer wirtten in Python.
+  - [Sfact](http://reprap.org/wiki/Sfact) is an improved version.
+  - [Simple G-Code introduction](http://fabmetheus.crsndoo.com/wiki/index.php/G-Code)