diff --git a/v2.3.x/site/en/reference/scalar_index.md b/v2.3.x/site/en/reference/scalar_index.md
index e55ac9981..3512a8bc6 100644
--- a/v2.3.x/site/en/reference/scalar_index.md
+++ b/v2.3.x/site/en/reference/scalar_index.md
@@ -28,6 +28,7 @@ Specifically, indexing algorithms for scalar fields vary with field data types.
 | ----------------------------- | --------------------------------- |
 | BOOL                          | STL sort                          |
 | VARCHAR                       | MARISA-trie                       |
+| INT8                          | STL sort                          |
 | INT16                         | STL sort                          |
 | INT32                         | STL sort                          |
 | INT64                         | STL sort                          |