diff --git a/README.md b/README.md
index 794e773..42425ce 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
 # leetcode-readme
 
-update you leetcode status page in your profile
\ No newline at end of file
+update you leetcode status page in your profile
+
+reference:
+
+1. <https://github.com/KnlnKS/leetcode-stats>
+
+2. <https://github.com/tbeachill/leetcode-skills-box/tree/main?tab=readme-ov-file>