diff --git a/README.md b/README.md
index aff9367..5168fd3 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,19 @@ docker run -v /home/sombochea/excel2json:/app/data -e APP_NAME="EXCEL 2 JSON" -e
 }
 ```
 
+# Custom Function Props
+```javascript
+{
+    mappings: [
+        {
+            "dataIndex": "Name",
+            "label": "Name"
+        }
+    ],
+    saveToOutput: false
+}
+```
+
 # Environment
 
 ```env
diff --git a/index.js b/index.js
index ffd8463..4bca17e 100644
--- a/index.js
+++ b/index.js
@@ -2,15 +2,7 @@
 const excel2json = require("./excel2json");
 
 // called function export excel2json
-const exported = excel2json({
-    mappings: [
-        {
-            "dataIndex": "Name",
-            "label": "Name"
-        }
-    ],
-    "saveToOutput": false
-});
+const exported = excel2json();
 
 // output data from exported
 console.log("Output =>\n", exported);