diff --git a/JsonExcel.vue b/JsonExcel.vue
index d033435..b62b70e 100644
--- a/JsonExcel.vue
+++ b/JsonExcel.vue
@@ -128,7 +128,7 @@ export default {
     export:async function(data, filename, mime) {
       let blob = this.base64ToBlob(data, mime);
       if(typeof this.beforeFinish === 'function')
-        await this.beforeFinish();
+        await this.beforeFinish(blob);
       download(blob, filename, mime);
     },
     /*
diff --git a/README.md b/README.md
index bbf246f..9180517 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ In your template
 | worksheet | string | Name of the worksheet tab.  default: 'Sheet1' |
 | fetch  | Function | Callback to fetch data before download, if it's set it runs immediately after mouse pressed and before download process. IMPORTANT: only works if no data prop is defined |
 | before-generate  | Function | Callback to call a method right before the generate / fetch data, eg:show loading progress |
-| before-finish  | Function | Callback to call a method right before the download box pops out, eg:hide loading progress |
+| before-finish  | Function | Callback to call a method right before the download box pops out, eg:hide loading progress. Gets resulting binary blob as argument for examination or reuse. |
 
 
 ## Example
@@ -238,8 +238,9 @@ export default {
     startDownload(){
         alert('show loading');
     },
-    finishDownload(){
+    finishDownload(blob){
         alert('hide loading');
+        alert(`file size: ${blob.size}`);
     }
   }
 };
diff --git a/package.json b/package.json
index a543c5b..cb1e9c5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-json-excel",
-  "version": "0.2.98",
+  "version": "0.2.99",
   "description": "Download your JSON as an excel or CSV file directly from the browser",
   "main": "JsonExcel.vue",
   "scripts": {