diff --git a/internal/util/typeutil/index.go b/internal/util/typeutil/index.go
index 7e7673884f..7187c11982 100644
--- a/internal/util/typeutil/index.go
+++ b/internal/util/typeutil/index.go
@@ -13,6 +13,9 @@ package typeutil
 
 import "github.com/milvus-io/milvus/internal/proto/commonpb"
 
+// CompareIndexParams compares indexParam1 with indexParam2. When all keys of indexParam1 exist in indexParam2,
+// and the corresponding value are the same as in indexParam2, return true
+// Otherwise return false
 func CompareIndexParams(indexParam1 []*commonpb.KeyValuePair, indexParam2 []*commonpb.KeyValuePair) bool {
 	if indexParam1 == nil && indexParam2 == nil {
 		return true