diff --git a/AUTHORS b/AUTHORS
index 17fe246de4..01cde401e3 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -11,3 +11,5 @@ Original Authors "mruby developers" are:
    Masaki Muranaka
    Internet Initiative Japan Inc.
    Tadashi FUKUZAWA
+   Ryosuke MATSUMOTO
+   Yasuhiro Matsumoto