diff --git a/README b/README
index 214e47d..b63f61c 100644
--- a/README
+++ b/README
@@ -1,51 +1,62 @@
-INTRODUCTION
-------------
-ucore is a teaching OS which is derived from xv6&jos in MIT, OS161 in Harvard and Linux and developed by Tsinghua University.
-The codes in the files that constitute xv6&jos are Copyright 2006-2007 Frans Kaashoek, Robert Morris, and Russ Cox and uses MIT License.
-The codes in the files that constitute OS/161 are written by David A. Holland.
-The docs and codes in the files that constitute ucore are Copyright 2012 Yu Chen, Naizheng Wang, Yong Xiang and uses GPL License. 
-
-CONTENTS
---------
-lab1: boot/protect mode/stack/interrupt
-lab2: physical memory management
-lab3: virtual memory management
-lab4: kernel thread management
-lab5: user process management
-lab6: scheduling
-lab7: mutex/sync
-lab8: filesystem
-
-EXERCISE STEPS
---------------
-1 $cd labX  
-2 read codes (specially the modified or added files)
-3 add your code
-4 compile your code
-  $make
-5 check your code
-  $make qemu
-OR
-  $make grade
-6 handin your code
-  $make handin
-
-RESOURCE REPOSITORY
--------------------
-The newest lab codes and docs is in https://github.com/chyyuu/ucore_pub or https://bitbucket.org/chyyuu/ucore_pub
-
-LEARNING DISSCUSS GROUPS
-------------------------
-If you have any questions about ucore labs, 
-you can subscribe to the Google Groups "os-course" group (http://groups.google.com/group/oscourse?hl=en.)
-To post to this group, send email to oscourse@googlegroups.com.
-To unsubscribe from this group, send email to oscourse+unsubscribe@googlegroups.com.
-For more options, visit this group at http://groups.google.com/group/oscourse?hl=en.
-
-DEVELOPMENT DISCUSS GROUPS
---------------------------
-If you want to be a developer of ucore or pay attention to the development of ucore, 
-you can subscribe to the Google Groups "ucore_dev" group (http://groups.google.com/group/ucore_dev?hl=en.)
-To post to this group, send email to ucore_dev@googlegroups.com.
-To unsubscribe from this group, send email to ucore_dev+unsubscribe@googlegroups.com.
-For more options, visit this group at http://groups.google.com/group/ucore_dev?hl=en.
+INTRODUCTION
+------------
+ucore is a teaching OS which is derived from xv6&jos in MIT, OS161 in Harvard and Linux.
+ucore was developed and used in Department of Computer Science & Technology, Institute for Interdisciplinary Information Sciences, Tsinghua University.
+The codes in the files that constitute xv6&jos are Copyright (2006-Current) Frans Kaashoek, Robert Morris, and Russ Cox and uses MIT License.
+The codes in the files that constitute OS/161 are written by David A. Holland.
+The docs and codes in the files that constitute ucore are Copyright (2010-Current) Yu Chen, Naizheng Wang, Yong Xiang and uses GPL License. 
+
+CONTENTS
+--------
+lab1: boot/protect mode/stack/interrupt
+lab2: physical memory management
+lab3: virtual memory management
+lab4: kernel thread management
+lab5: user process management
+lab6: scheduling
+lab7: mutex/sync
+lab8: filesystem
+
+EXERCISE STEPS
+--------------
+1 $cd labX  
+2 read codes (specially the modified or added files)
+3 add your code
+4 compile your code
+  $make
+5 check your code
+  $make qemu
+OR
+  $make grade
+6 handin your code
+  $make handin
+
+RESOURCE REPOSITORY
+-------------------
+Basic OS labs (for students who learn OS course)
+The newest lab codes and docs is in https://github.com/chyyuu/ucore_pub
+
+Advanced OS labs (for OS geeks or hackers)
+The newest lab codes and docs is in https://github.com/chyyuu/ucore_plus
+
+LEARNING DISSCUSS GROUPS
+------------------------
+If you have any questions about ucore basic os labs, 
+you can subscribe to the Google Groups "os-course" group (http://groups.google.com/group/oscourse?hl=en.)
+To post to this group, send email to oscourse@googlegroups.com.
+To unsubscribe from this group, send email to oscourse+unsubscribe@googlegroups.com.
+For more options, visit this group at http://groups.google.com/group/oscourse?hl=en.
+
+DEVELOPMENT DISCUSS GROUPS
+--------------------------
+If you have any questions about ucore advanced os labs, 
+If you want to be a developer of ucore or pay attention to the development of ucore, 
+you can subscribe to the Google Groups "ucore_dev" group (http://groups.google.com/group/ucore_dev?hl=en.)
+To post to this group, send email to ucore_dev@googlegroups.com.
+To unsubscribe from this group, send email to ucore_dev+unsubscribe@googlegroups.com.
+For more options, visit this group at http://groups.google.com/group/ucore_dev?hl=en.
+
+UCORERS (Contributors)
+---------------------
+Junjie Mao, Yuheng Chen, Cong Liu, Yang Yang, Zhun Qu, Shengwei Ren, Wenlei Zhu, Cao Zhang, Tong Sen, Xu Chen, 
+Cang Nan, Yujian Fang, Wentao Han, Kaichen Zhang, Xiaolin Guo, Tianfan Xue, Gang Hu, Cao Liu, Yu Su,Xinhao Yuan, ...