diff --git a/README.md b/README.md
index 340f579..f1363f2 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ A push notification server using [Gin](https://github.com/gin-gonic/gin) framewo
 * Support notification queue and multiple workers.
 * Support `/api/stat/app` show notification success and failure counts.
 * Support `/api/config` show your yml config.
-* Support store app stat to [redis](http://redis.io/) or memory.
+* Support store app stat to memory, [redis](http://redis.io/) or [BoltDB](https://github.com/boltdb/bolt).
 
 See the [YAML config example](config/config.yml):
 
diff --git a/gorush/config.go b/gorush/config.go
index 7511ee7..4e8f60e 100644
--- a/gorush/config.go
+++ b/gorush/config.go
@@ -61,7 +61,7 @@ type SectionLog struct {
 
 // SectionStat is sub seciont of config.
 type SectionStat struct {
-	Engine string        `yaml:"service"`
+	Engine string        `yaml:"engine"`
 	Redis  SectionRedis  `yaml:"redis"`
 	BoltDB SectionBoltDB `yaml:"boltdb"`
 }