diff --git a/README.md b/README.md
index e7323049..3b62debb 100644
--- a/README.md
+++ b/README.md
@@ -197,6 +197,7 @@ Read [CONTRIBUTING.md](/CONTRIBUTING.md) to learn how to add your own repos.
 #### Common Lisp
 
 *Solutions to AoC in Common Lisp.*
+* [guojing0/aoc-2021]
 
 
 #### Crystal