diff --git a/_Sidebar.md b/_Sidebar.md
index 5679a52..b582e77 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -12,6 +12,8 @@
 
 [Searching with ANNOY index](https://github.com/milvus-io/milvus/wiki/Searching-with-ANNOY-index)
 
+[Similarity Metrics](https://github.com/milvus-io/milvus/wiki/Similarity-Metrics)
+
 [Hybrid Search](https://github.com/milvus-io/milvus/wiki/Hybrid-Search)
 
 # Advanced Deployment