diff --git a/README.org b/README.org
index 2a13f41..fe33edc 100644
--- a/README.org
+++ b/README.org
@@ -141,6 +141,7 @@ Nonfree Software / 非自由軟件：
 *** Services / 服務
 + btrbk-service-type
 + clash-service-type
++ docker-mailserver-service-type
 + iwd-service-type
 + jellyfin-service-type
 + miniflux-service-type