diff --git a/config/configs.go b/config/configs.go
index 9279dfc..721eaa1 100644
--- a/config/configs.go
+++ b/config/configs.go
@@ -64,7 +64,7 @@ type (
 		EnabledSession 	bool   `xml:"enabled,attr"`  //启用Session
 		SessionMode    	string `xml:"mode,attr"`     //session mode，now support runtime、redis
 		CookieName	   	string `xml:"cookiename,attr"` //custom cookie name which sessionid store, default is dotweb_sessionId
-		Timeout        	int64  `xml:"timeout,attr"`  //session time-out period, with minute
+		Timeout        	int64  `xml:"timeout,attr"`  //session time-out period, with second
 		ServerIP       	string `xml:"serverip,attr"` //remote session server url
 		BackupServerUrl	string `xml:"backupserverurl,attr"` //backup remote session server url
 		StoreKeyPre 	string `xml:"storekeypre,attr"` //remote session StoreKeyPre
diff --git a/session/session.go b/session/session.go
index 898e8c4..b9600ab 100644
--- a/session/session.go
+++ b/session/session.go
@@ -34,7 +34,7 @@ type (
 	//session config info
 	StoreConfig struct {
 		StoreName   	string
-		Maxlifetime 	int64
+		Maxlifetime 	int64  //session life time, with second
 		CookieName  	string //custom cookie name which sessionid store
 		ServerIP    	string //if use redis, connection string, like "redis://:password@10.0.1.11:6379/0"
 		BackupServerUrl string //if use redis, if ServerIP is down, use this server, like "redis://:password@10.0.1.11:6379/0"
diff --git a/session/store_runtime.go b/session/store_runtime.go
index 9db3bfb..14d7d52 100644
--- a/session/store_runtime.go
+++ b/session/store_runtime.go
@@ -11,7 +11,7 @@ type RuntimeStore struct {
 	lock        *sync.RWMutex            // locker
 	sessions    map[string]*list.Element // map in memory
 	list        *list.List               // for gc
-	maxlifetime int64
+	maxlifetime int64					 // session life time, with second
 }
 
 func NewRuntimeStore(config *StoreConfig) *RuntimeStore {
diff --git a/version.MD b/version.MD
index b0fb376..b9f0421 100644
--- a/version.MD
+++ b/version.MD
@@ -1,5 +1,10 @@
 ## dotweb版本记录：
 
+#### Version 1.5.7.8
+* Improve Comments about session Maxlifetime
+* Session.StoreConfig.Maxlifetime: session life time, with second
+* 2018-09-20 15:00
+
 #### Version 1.5.7.7
 * New Feature: Add HttpServer.SetEnabledAutoOPTIONS, used to set route use auto options
 * Detail: