diff --git a/README.md b/README.md
index ee3a025d807330161ce69b993679f9044ed2db1f..fddc9f3daf466df7d4b07344bb75f5a5dbe64f21 100644
--- a/README.md
+++ b/README.md
@@ -144,5 +144,11 @@ db.orders.aggregate( { $sortByCount: "$customer.id" } ).pretty()
 ### requête 7
 
 ```js
-
+db.orders.aggregate( [ 
+    { $unwind : "$items" }, 
+    { $group : { 
+        _id : "$items.vendor", 
+        chiffreAffaires : { "$sum" : "$items.finalprice" } 
+    } } 
+]).pretty()
 ```