diff --git a/README.md b/README.md
index b3ca64b..0f5e11e 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ This document is a guide to participate in Multi-party Computation(MPC) phase 2
       + Memory: 8 GB RAM
       + Storage: 4 GB free Disk storage
       
-  On Windows, please go to [rust](https://www.rust-lang.org/learn/get-started) homepage for installation instruction, then jump to next step.
+  On Windows, please go to [rust](https://www.rust-lang.org/learn/get-started) homepage for installation instruction, then install [Microsoft Visual C++ Build Tools](http://go.microsoft.com/fwlink/?LinkId=691126); at last, jump to next step.
 
   On Mac, install xcode command line tools first:
 ```
diff --git a/participants.md b/participants.md
index e793ef5..7f2ef43 100644
--- a/participants.md
+++ b/participants.md
@@ -85,6 +85,7 @@ Index | Name | Email | Completed date
 081 | Jimmy | himalayan.8848.asia@gmail.com | 2020-02-26
 082 | Josie Wang | josie.wang66@gmail.com | 2020-02-27
 083 | Tiffani Yang | yangting950803@gmail.com | 2020-02-28
+084 | Mustafa khater | khatermustafa5@gmail.com | 2020-02-28
 
 ## Ongoing participants
 
@@ -93,7 +94,6 @@ Name | Email |
 Петр Порошенко   | relomonos12@gmail.com |
 Jack Renfroe   | jackrenfroe@protonmail.com |
 Howard Boelky | howardboelky78@gmail.com |
-Mustafa khater | khaterm14@gmail.com |
 Alper KILIÇER |alpertunga333@gmail.com |
 Pedro Peñaloza | manfrediscompany@gmail.com |
 Aditya Vijendea |adityavijendra@gmail.com |