diff --git a/README.md b/README.md
index c477a77..f14e684 100644
--- a/README.md
+++ b/README.md
@@ -93,10 +93,10 @@ glider -config CONFIG_PATH
 glider -verbose -listen :8443 -forward SCHEME://HOST:PORT
 ```
 
-**Help:**  `glider -help`
+**Help:**
 
 <details>
-<summary>click to see details</summary>
+<summary>`glider -help` click to see details</summary>
 
 ```bash
 Usage: glider [-listen URL]... [-forward URL]... [OPTION]...
@@ -115,6 +115,8 @@ OPTION:
         check disabled fowarders only
   -checkinterval int
         fowarder check interval(seconds) (default 30)
+  -checklatencysamples int
+        use the average latency of the latest N checks (default 10)
   -checktimeout int
         fowarder check timeout(seconds) (default 10)
   -checktolerance int
@@ -191,7 +193,7 @@ URL:
          -forward socks5://serverA:1080,socks5://serverB:1080           (proxy chain)
 
 SCHEME:
-   listen : http kcp mixed pxyproto redir redir6 smux socks5 ss tcp tls tproxy trojan trojanc udp unix vless ws wss
+   listen : http kcp mixed pxyproto redir redir6 smux sni socks5 ss tcp tls tproxy trojan trojanc udp unix vless ws wss
    forward: direct http kcp reject simple-obfs smux socks4 socks4a socks5 ss ssh ssr tcp tls trojan trojanc udp unix vless vmess ws wss
 
    Note: use 'glider -scheme all' or 'glider -scheme SCHEME' to see help info for the scheme.
@@ -222,10 +224,10 @@ glider 0.16.0, https://github.com/nadoo/glider
 
 </details>
 
-**Schemes:** `glider -scheme all`
+**Schemes:**
 
 <details>
-<summary>click to see details</summary>
+<summary>`glider -scheme all` click to see details</summary>
 
 ```bash
 KCP scheme:
@@ -337,10 +339,10 @@ TLS and Websocket with a specified proxy protocol:
 
 </details>
 
-**Examples:** `glider -example`
+**Examples:**
 
 <details>
-<summary>click to see details</summary>
+<summary>`glider -example` click to see details</summary>
 
 ```bash
 Examples:
diff --git a/config.go b/config.go
index 271ec73..d032ba9 100644
--- a/config.go
+++ b/config.go
@@ -66,7 +66,7 @@ check=disable: disable health check`)
 	flag.IntVar(&conf.Strategy.CheckInterval, "checkinterval", 30, "fowarder check interval(seconds)")
 	flag.IntVar(&conf.Strategy.CheckTimeout, "checktimeout", 10, "fowarder check timeout(seconds)")
 	flag.IntVar(&conf.Strategy.CheckTolerance, "checktolerance", 0, "fowarder check tolerance(ms), switch only when new_latency < old_latency - tolerance, only used in lha mode")
-	flag.IntVar(&conf.Strategy.CheckLatencySamples, "checklatencysamples", 1, "use the average latency of the latest N checks")
+	flag.IntVar(&conf.Strategy.CheckLatencySamples, "checklatencysamples", 10, "use the average latency of the latest N checks")
 	flag.BoolVar(&conf.Strategy.CheckDisabledOnly, "checkdisabledonly", false, "check disabled fowarders only")
 	flag.IntVar(&conf.Strategy.MaxFailures, "maxfailures", 3, "max failures to change forwarder status to disabled")
 	flag.IntVar(&conf.Strategy.DialTimeout, "dialtimeout", 3, "dial timeout(seconds)")
diff --git a/config/glider.conf.example b/config/glider.conf.example
index 793a9a7..9843109 100644
--- a/config/glider.conf.example
+++ b/config/glider.conf.example
@@ -208,6 +208,9 @@ checktimeout=10
 # switch forwarder only when new_latency < old_latency - tolerance, used in lha mode
 checktolerance=100
 
+# use the average latency of the latest N checks
+checklatencysamples=10
+
 # check disabled fowarders only
 checkdisabledonly=false
 
diff --git a/rule/config.go b/rule/config.go
index 82deaeb..77e653f 100644
--- a/rule/config.go
+++ b/rule/config.go
@@ -47,7 +47,7 @@ func NewConfFromFile(ruleFile string) (*Config, error) {
 	f.StringVar(&p.Strategy.Check, "check", "http://www.msftconnecttest.com/connecttest.txt#expect=200", "check=tcp[://HOST:PORT]: tcp port connect check\ncheck=http://HOST[:PORT][/URI][#expect=STRING_IN_RESP_LINE]\ncheck=file://SCRIPT_PATH: run a check script, healthy when exitcode=0, environment variables: FORWARDER_ADDR\ncheck=disable: disable health check")
 	f.IntVar(&p.Strategy.CheckInterval, "checkinterval", 30, "fowarder check interval(seconds)")
 	f.IntVar(&p.Strategy.CheckTimeout, "checktimeout", 10, "fowarder check timeout(seconds)")
-	f.IntVar(&p.Strategy.CheckLatencySamples, "checklatencysamples", 1, "use the average latency of the latest N checks")
+	f.IntVar(&p.Strategy.CheckLatencySamples, "checklatencysamples", 10, "use the average latency of the latest N checks")
 	f.IntVar(&p.Strategy.CheckTolerance, "checktolerance", 0, "fowarder check tolerance(ms), switch only when new_latency < old_latency - tolerance, only used in lha mode")
 	f.BoolVar(&p.Strategy.CheckDisabledOnly, "checkdisabledonly", false, "check disabled fowarders only")
 	f.IntVar(&p.Strategy.MaxFailures, "maxfailures", 3, "max failures to change forwarder status to disabled")
diff --git a/rule/group.go b/rule/group.go
index dd3aa12..7d3272a 100644
--- a/rule/group.go
+++ b/rule/group.go
@@ -276,8 +276,8 @@ func (p *FwdrGroup) check(fwdr *Forwarder, checker Checker) {
 func (p *FwdrGroup) setLatency(fwdr *Forwarder, elapsed time.Duration) {
 	newLatency := int64(elapsed)
 	if cnt := p.config.CheckLatencySamples; cnt > 1 {
-		if lastLagency := fwdr.Latency(); lastLagency > 0 {
-			newLatency = (lastLagency*(int64(cnt)-1) + int64(elapsed)) / int64(cnt)
+		if lastLatency := fwdr.Latency(); lastLatency > 0 {
+			newLatency = (lastLatency*(int64(cnt)-1) + int64(elapsed)) / int64(cnt)
 		}
 	}
 	fwdr.SetLatency(newLatency)