diff --git a/utils/string.go b/utils/string.go
index 1de14434..ad9803b7 100644
--- a/utils/string.go
+++ b/utils/string.go
@@ -62,6 +62,7 @@ func ChineseLength(str string, limit int) int {
 	return sum
 }
 
+// from github.com/savsgio/gotils/strconv
 // B2S converts byte slice to a string without memory allocation.
 // See https://groups.google.com/forum/#!msg/Golang-Nuts/ENgbUzYvCuU/90yGx7GUAgAJ .
 func B2S(b []byte) string {