diff --git a/luci-app-mosdns/luasrc/model/cbi/mosdns/basic.lua b/luci-app-mosdns/luasrc/model/cbi/mosdns/basic.lua
index 5533067..ef621da 100644
--- a/luci-app-mosdns/luasrc/model/cbi/mosdns/basic.lua
+++ b/luci-app-mosdns/luasrc/model/cbi/mosdns/basic.lua
@@ -8,7 +8,7 @@ else
 end
 m = Map("mosdns")
 m.title = translate("MosDNS") .. " " .. mosdns_version
-m.description = translate("MosDNS is a 'programmable' DNS forwarder.")
+m.description = translate("MosDNS is a plugin-based DNS forwarder/traffic splitter.")
 
 m:section(SimpleSection).template = "mosdns/mosdns_status"
 
@@ -135,12 +135,12 @@ o.rmempty = false
 o.default = false
 o:depends("configfile", "/etc/mosdns/config.yaml")
 
-o = s:taboption("advanced", Value, "cache_size", translate("DNS Cache Size"))
+o = s:taboption("advanced", Value, "cache_size", translate("DNS Cache Size"), translate("DNS cache size (in piece). To disable caching, please set to 0."))
 o.datatype = "and(uinteger,min(0))"
 o.default = "8000"
 o:depends("configfile", "/etc/mosdns/config.yaml")
 
-o = s:taboption("advanced", Value, "cache_survival_time", translate("Cache Survival Time"))
+o = s:taboption("advanced", Value, "cache_survival_time", translate("Lazy Cache TTL"), translate("Lazy cache survival time (in second). To disable Lazy Cache, please set to 0."))
 o.datatype = "and(uinteger,min(0))"
 o.default = "86400"
 o:depends("configfile", "/etc/mosdns/config.yaml")
diff --git a/luci-app-mosdns/po/zh-cn/mosdns.po b/luci-app-mosdns/po/zh-cn/mosdns.po
index 7c9beca..94677bb 100644
--- a/luci-app-mosdns/po/zh-cn/mosdns.po
+++ b/luci-app-mosdns/po/zh-cn/mosdns.po
@@ -13,7 +13,7 @@ msgstr "Cloudflare 选项"
 msgid "API Options"
 msgstr "API 选项"
 
-msgid "MosDNS is a 'programmable' DNS forwarder."
+msgid "MosDNS is a plugin-based DNS forwarder/traffic splitter."
 msgstr "MosDNS 是一个插件化的 DNS 转发/分流器。"
 
 msgid "RUNNING"
@@ -230,10 +230,16 @@ msgid "Enable this option fallback policy forces forwarding to remote DNS"
 msgstr "启用此选项 fallback 策略会强制转发到远程 DNS"
 
 msgid "DNS Cache Size"
-msgstr "DNS 缓存大小（条）"
+msgstr "DNS 缓存大小"
 
-msgid "Cache Survival Time"
-msgstr "缓存生存时间（秒）"
+msgid "DNS cache size (in piece). To disable caching, please set to 0."
+msgstr "DNS 缓存大小（单位：条），要禁用缓存，请设置为 0"
+
+msgid "Lazy Cache TTL"
+msgstr "乐观缓存 TTL"
+
+msgid "Lazy cache survival time (in second). To disable Lazy Cache, please set to 0."
+msgstr "乐观缓存生存时间（单位：秒），要禁用乐观缓存，请设置为 0"
 
 msgid "Cache Dump"
 msgstr "自动保存缓存"
diff --git a/luci-app-mosdns/root/etc/init.d/mosdns b/luci-app-mosdns/root/etc/init.d/mosdns
index 6646b72..d46d99c 100755
--- a/luci-app-mosdns/root/etc/init.d/mosdns
+++ b/luci-app-mosdns/root/etc/init.d/mosdns
@@ -110,6 +110,8 @@ init_yaml() {
     else
         sed -i '/\$cloudflare_cidr\|CLOUDFLARE_IP/d' $CONF
     fi
+    # disable lazy_cache plugin when cache_size is 0
+    [ $cache_size -eq 0 ] && sed -i -E ':l;N;/exec: \$lazy_cache/s/(\n[^\n]*){6}$//;bl' $CONF
     rm -rf $TMPDIR
 }