diff --git a/Cargo.lock b/Cargo.lock
index 14f4232..3860506 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "arrayvec"
 version = "0.4.7"
diff --git a/participants.md b/participants.md
index 0af23a1..3bde662 100644
--- a/participants.md
+++ b/participants.md
@@ -62,7 +62,7 @@ Index | Name | Email | Completed date
 058 | Yuki Xue | xueyuanying123@gmail.com | 2020-02-13
 059 | Boyan Shen | shenboyan0325@gmail.com | 2020-02-13
 060 | Slogan.Wang | wangxuguo@gmail.com    | 2020-02-14
-
+061 | David Stern | loktarogar1@163.com    | 2020-02-14
 ## Ongoing participants
 
 Name | Email |