diff --git a/luci-app-fchomo/htdocs/luci-static/resources/view/fchomo/global.js b/luci-app-fchomo/htdocs/luci-static/resources/view/fchomo/global.js
index 1d4f438df..92158d0b5 100644
--- a/luci-app-fchomo/htdocs/luci-static/resources/view/fchomo/global.js
+++ b/luci-app-fchomo/htdocs/luci-static/resources/view/fchomo/global.js
@@ -521,6 +521,7 @@ return view.extend({
 		so.placeholder = '65536';
 
 		so = ss.option(form.Value, 'tun_udp_timeout', _('UDP NAT expiration time'),
+			_('Aging time of NAT map maintained by client.</br>') +
 			_('In seconds. <code>%s</code> will be used if empty.').format('300'));
 		so.placeholder = '300';
 		so.validate = L.bind(hm.validateTimeDuration, so);
diff --git a/luci-app-fchomo/po/templates/fchomo.pot b/luci-app-fchomo/po/templates/fchomo.pot
index f68e56fc2..8be3b7f84 100644
--- a/luci-app-fchomo/po/templates/fchomo.pot
+++ b/luci-app-fchomo/po/templates/fchomo.pot
@@ -134,9 +134,13 @@ msgstr ""
 msgid "Address"
 msgstr ""
 
-#: htdocs/luci-static/resources/view/fchomo/global.js:727
-#: htdocs/luci-static/resources/view/fchomo/global.js:775
-#: htdocs/luci-static/resources/view/fchomo/global.js:794
+#: htdocs/luci-static/resources/view/fchomo/global.js:524
+msgid "Aging time of NAT map maintained by client.</br>"
+msgstr ""
+
+#: htdocs/luci-static/resources/view/fchomo/global.js:728
+#: htdocs/luci-static/resources/view/fchomo/global.js:776
+#: htdocs/luci-static/resources/view/fchomo/global.js:795
 msgid "All allowed"
 msgstr ""
 
diff --git a/luci-app-fchomo/po/zh_Hans/fchomo.po b/luci-app-fchomo/po/zh_Hans/fchomo.po
index 8e3f2588e..2d9e134c5 100644
--- a/luci-app-fchomo/po/zh_Hans/fchomo.po
+++ b/luci-app-fchomo/po/zh_Hans/fchomo.po
@@ -141,9 +141,13 @@ msgstr "添加后缀"
 msgid "Address"
 msgstr "地址"
 
-#: htdocs/luci-static/resources/view/fchomo/global.js:727
-#: htdocs/luci-static/resources/view/fchomo/global.js:775
-#: htdocs/luci-static/resources/view/fchomo/global.js:794
+#: htdocs/luci-static/resources/view/fchomo/global.js:524
+msgid "Aging time of NAT map maintained by client.</br>"
+msgstr "客户端维护的 NAT 映射 的老化时间。</br>"
+
+#: htdocs/luci-static/resources/view/fchomo/global.js:728
+#: htdocs/luci-static/resources/view/fchomo/global.js:776
+#: htdocs/luci-static/resources/view/fchomo/global.js:795
 msgid "All allowed"
 msgstr "允许所有"
 
diff --git a/luci-app-fchomo/po/zh_Hant/fchomo.po b/luci-app-fchomo/po/zh_Hant/fchomo.po
index bf72147f0..682190f72 100644
--- a/luci-app-fchomo/po/zh_Hant/fchomo.po
+++ b/luci-app-fchomo/po/zh_Hant/fchomo.po
@@ -141,9 +141,13 @@ msgstr "添加後綴"
 msgid "Address"
 msgstr "位址"
 
-#: htdocs/luci-static/resources/view/fchomo/global.js:727
-#: htdocs/luci-static/resources/view/fchomo/global.js:775
-#: htdocs/luci-static/resources/view/fchomo/global.js:794
+#: htdocs/luci-static/resources/view/fchomo/global.js:524
+msgid "Aging time of NAT map maintained by client.</br>"
+msgstr "客戶端維護的 NAT 映射 的老化時間。</br>"
+
+#: htdocs/luci-static/resources/view/fchomo/global.js:728
+#: htdocs/luci-static/resources/view/fchomo/global.js:776
+#: htdocs/luci-static/resources/view/fchomo/global.js:795
 msgid "All allowed"
 msgstr "允許所有"