diff --git a/README.md b/README.md
index c6948ec..8aab010 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,20 @@ function updateHandler(data, matter) {
 editor.read(filePath).data(updateHandler);
 ```
 
+You can use the optional third parameter `fileSystemInfo` to access information about the file itself:
+
+```
+let extend = require('util')._extend;
+
+function updateHandler(data, matter, fileSystemInfo) {
+  const d = fileSystemInfo.status.mtime;
+  data.last_updated = [d.getFullYear(), d.getMonth()+1, d.getDate()].join('-');
+  matter.data = data;
+}
+
+editor.read(filePath).data(updateHandler);
+```
+
 ## .content()
 This method update content in file.
 ```
@@ -84,6 +98,8 @@ function updateHandler(content, matter) {
 editor.read(filePath).content(updateHandler);
 ```
 
+This method also supports the optional third parameter `fileSystemInfo` for the callback.
+
 ## .save(destDirPath, options, callback)
 
 this method save to file. if this method have not options, save file by default options. default options is same filename with source file.
diff --git a/index.js b/index.js
index 12a315f..7af95f6 100644
--- a/index.js
+++ b/index.js
@@ -29,18 +29,18 @@ class FrontMatterService {
   }
 
   extend(func) {
-    func(this.matter.data, this.matter.content, this.matter);
+    func(this.matter.data, this.matter.content, this.matter, this.fileSystemInfo);
     return this;
   }
 
   data(func) {
     // this.matter = extend(this.matter, obj);
-    func(this.matter.data, this.matter);
+    func(this.matter.data, this.matter, this.fileSystemInfo);
     return this;
   }
 
   content(func) {
-    func(this.matter.content, this.matter);
+    func(this.matter.content, this.matter, this.fileSystemInfo);
     return this;
   }
 
@@ -79,4 +79,3 @@ module.exports = new FrontMatterService();
 // module.exports.prototype.show = function(){
 //   console.log(this.)
 // }
-