diff --git a/docs/contribution.md b/docs/contribution.md
index aaf4f18..306442a 100644
--- a/docs/contribution.md
+++ b/docs/contribution.md
@@ -13,6 +13,7 @@ possible.
   - `service/slack` - Slack notification service.
   - `service/telegram` - Telegram notification service.
   - `service/pushover` - Pushover Notification service.
+  - `service/line` - Line notification service.
   
 ### Documentation