diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..ef51547
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 HuanGong
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index e91c3d9..1963ee9 100644
--- a/README.md
+++ b/README.md
@@ -145,6 +145,6 @@ func main() {
 
 Copyright (C) 2018, by HuanGong [gonghuan.dev@gmail.com](mailto:gonghuan.dev@gmail.com).
 
-Under the Apache License, Version 2.0.
+Under the MIT License.
 
 See the [LICENSE](LICENSE) file for details.
diff --git a/logger.go b/logger.go
index 1a115f7..ff820c5 100644
--- a/logger.go
+++ b/logger.go
@@ -9,7 +9,7 @@ const (
 )
 
 var (
-	LogLevel int           = DebugLevel // control defaultLogger log level
+	LogLevel int           = InfoLevel // control defaultLogger log level
 	Logger   BEIndexLogger = &DefaultLogger{}
 )