diff --git a/docs/en/12-taos-sql/27-indexing.md b/docs/en/12-taos-sql/27-indexing.md
index a89c8929c1..1badd38d17 100644
--- a/docs/en/12-taos-sql/27-indexing.md
+++ b/docs/en/12-taos-sql/27-indexing.md
@@ -19,6 +19,9 @@ index_option:
 functions:
     function [, function] ...
 ```
+### tag Indexing
+
+  [tag index](../tag-index)
 
 ### SMA Indexing
 
diff --git a/docs/zh/12-taos-sql/27-index.md b/docs/zh/12-taos-sql/27-index.md
index da8f38eb22..327d909616 100644
--- a/docs/zh/12-taos-sql/27-index.md
+++ b/docs/zh/12-taos-sql/27-index.md
@@ -20,6 +20,8 @@ index_option:
 functions:
     function [, function] ...
 ```
+### tag 索引
+ [tag-index] (../tag-index)
 
 ### SMA 索引