diff --git a/series_xstring.go b/series_xstring.go
index dbb98439f51075ec00024c8e9a370d911b8d04ac..e51c95901bf32ae60716a11d7fd764c5791c7e40 100644
--- a/series_xstring.go
+++ b/series_xstring.go
@@ -5,6 +5,7 @@ import (
 	"reflect"
 )
 
+// SeriesString 字符串类型序列
 type SeriesString struct {
 	SeriesFrame
 	Data []string