diff --git a/metadata.md b/metadata.md
index baa5ef0..da27f40 100644
--- a/metadata.md
+++ b/metadata.md
@@ -97,3 +97,4 @@
 [请回答 二〇二一 | 叶星优酸乳](https://weiyexing.ml/posts/back-to-2021/)
 [逝去的2021 | iTimothy](https://xiaozhou.net/2021-summary-2021-12-31.html)
 [间奏曲 | 大破进击](https://jesor.me/2021/intermezzo/)
+[State of 2021 | DonaldxDocs](http://article.donaldxdonald.xyz/)