diff --git a/README.md b/README.md
index 2bce505..b74161b 100644
--- a/README.md
+++ b/README.md
@@ -24,9 +24,15 @@ func main() {
 	manager := manage.NewDefaultManager()
 
 	// use mysql token store
-	manager.MapTokenStorage(
-		mysql.NewStore(mysql.NewConfig("root:123456@tcp(127.0.0.1:3306)/myapp_test?charset=utf8"), "", 0),
+	store := mysql.NewStore(
+		mysql.NewConfig("root:123456@tcp(127.0.0.1:3306)/myapp_test?charset=utf8"), "", 0),
+		"",
+		0,
 	)
+
+	defer store.Close()
+
+	manager.MapTokenStorage(store)
 	// ...
 }
 
diff --git a/mysql.go b/mysql.go
index deab1bc..995983a 100644
--- a/mysql.go
+++ b/mysql.go
@@ -42,6 +42,9 @@ type Config struct {
 }
 
 // NewStore create mysql store instance,
+// config mysql configuration,
+// tableName table name (default oauth2_token),
+// GC time interval (in seconds, default 600)
 func NewStore(config *Config, tableName string, gcInterval int) *Store {
 	db, err := sql.Open("mysql", config.DSN)
 	if err != nil {
@@ -55,7 +58,10 @@ func NewStore(config *Config, tableName string, gcInterval int) *Store {
 	return NewStoreWithDB(db, tableName, gcInterval)
 }
 
-// NewStoreWithDB create mysql store instance
+// NewStoreWithDB create mysql store instance,
+// db sql.DB,
+// tableName table name (default oauth2_token),
+// GC time interval (in seconds, default 600)
 func NewStoreWithDB(db *sql.DB, tableName string, gcInterval int) *Store {
 	store := &Store{
 		db:        &gorp.DbMap{Db: db, Dialect: gorp.MySQLDialect{Encoding: "UTF8", Engine: "MyISAM"}},