diff --git a/README.md b/README.md
index 5fcd7b157ca4eba8bfaa4caf3a763608fa4aef87..f9a5d7e26d7354d2eed0ecd1c468683e68df450b 100644
--- a/README.md
+++ b/README.md
@@ -138,7 +138,12 @@ db.orders.find( {"customer.id" : NumberLong( "1848533681975648" )}).pretty()
 ### requête 6
 
 ```js
-db.orders.aggregate([{$group : {_id :"$customer.id", Nombre_Commandes:{$sum:1}}}])
+db.orders.aggregate([
+  { $group: { 
+    _id: { id: "$customer.id", pseudo: "$customer.pseudo" }, 
+    Nombre_Commandes:{$sum:1} 
+  } }
+])
 ```