diff --git a/src/8-radiant/8d-prop-tinymail.md b/src/8-radiant/8d-prop-tinymail.md
index 1b3dd4212..b7180df6e 100644
--- a/src/8-radiant/8d-prop-tinymail.md
+++ b/src/8-radiant/8d-prop-tinymail.md
@@ -227,7 +227,11 @@ wings.tiny.mail.service.max-done
 
 ### wings.tiny.mail.service.boot-scan
 
-`Duration`=`60s`, how long after start, scan for unsent mail, `0` for no scan.
+`Duration`=`60s`, idle time after afterPropertiesSet to scan for unsent/misfired mail, `<=0` for disable.
+
+### wings.tiny.mail.service.scan-idle
+
+`Duration`=`5m`, idle time to scan for unsent/misfired mail. `<=0` for disable.
 
 ### wings.tiny.mail.service.only-app
 
diff --git a/src/zh/8-radiant/8d-prop-tinymail.md b/src/zh/8-radiant/8d-prop-tinymail.md
index 9789ce8d4..838bf820b 100644
--- a/src/zh/8-radiant/8d-prop-tinymail.md
+++ b/src/zh/8-radiant/8d-prop-tinymail.md
@@ -212,7 +212,11 @@ wings.tiny.mail.service.max-done
 
 ### wings.tiny.mail.service.boot-scan
 
-`Duration`=`60s`，启动后多久，扫描未发送的邮件，`0`为不扫描
+`Duration`=`60s`，bean设值后多久开始扫描未发送的邮件，`<=0` 为禁止。
+
+### wings.tiny.mail.service.scan-idle
+
+`Duration`=`5s`，空闲多久开始扫描未发送的邮件，`<=0` 为禁止。
 
 ### wings.tiny.mail.service.only-app