diff --git a/README.md b/README.md
index e3f53ef..75b9bc0 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,10 @@ Webduino Module for UART.
 bower install https://github.com/webduinoio/webduino-module-uart.git
 ```
 
+## Usage
+
+Learn how to use, visit [doc](https://docs.google.com/document/d/1Lk0VuGdUv1yn86nwNujq0O_BItGtORErSKRtwGNuGRw/edit?usp=sharing).
+
 ## License
 
 This project is licensed under the MIT license, see [LICENSE](LICENSE) for more information.
diff --git a/blockly/javascript.js b/blockly/javascript.js
index b5d4db1..58a4f8f 100644
--- a/blockly/javascript.js
+++ b/blockly/javascript.js
@@ -18,7 +18,7 @@ Blockly.JavaScript['uart_rx'] = function(block) {
     var variable_uart = Blockly.JavaScript.variableDB_.getName(block.getFieldValue('uart'), Blockly.Variables.NAME_TYPE);
     var statements_rx = Blockly.JavaScript.statementToCode(block, 'rx');
     var code = variable_uart + '.rx(';
-    code += "function(){\n" + statements_rx + "});\n";
+    code += "async function () {\n" + statements_rx + "});\n";
     return code;
 };
 
@@ -28,4 +28,4 @@ Blockly.JavaScript['uart_data'] = function(block) {
     var dropdown_dataType = block.getFieldValue('dataType');
     var code = variable_uart + '.' + dropdown_dataType;
     return [code, Blockly.JavaScript.ORDER_NONE];
-};
\ No newline at end of file
+};
diff --git a/package.json b/package.json
index dcac813..c3800a1 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "",
-  "license": "ISC",
+  "license": "MIT",
   "keywords": [
     "arduino",
     "webduino",
@@ -16,4 +16,4 @@
   "dependencies": {
     "webduino-js": "0.x"
   }
-}
\ No newline at end of file
+}