diff --git a/src/01_recommendations/src/extract.js b/src/01_recommendations/src/extract.js
index ca46a16..8ccc09d 100644
--- a/src/01_recommendations/src/extract.js
+++ b/src/01_recommendations/src/extract.js
@@ -73,6 +73,7 @@ module.exports.extractExcelData = (ExcelTab, excelFilePath) => {
         obj[ExcelTab.EXCEL_COLUMN_NAMES[key]] = value
       }
 
+      obj.id = list.length
       list.push(obj)
     }