diff --git a/type/maputil/map_string_int.go b/type/maputil/map_string_int.go
index 40551282..8c912ce9 100644
--- a/type/maputil/map_string_int.go
+++ b/type/maputil/map_string_int.go
@@ -71,6 +71,8 @@ const (
 	SortValueDesc = "value desc"
 )
 
+// Sorted returns a set of key names and values sorted by
+// the sort type.
 func (msi MapStringInt) Sorted(sortBy string) []Record {
 	sortBy = strings.ToLower(strings.TrimSpace(sortBy))
 	records := []Record{}