diff --git a/manual/en/working-with-objects.txt b/manual/en/working-with-objects.txt
index cc0878069..5c677cc67 100644
--- a/manual/en/working-with-objects.txt
+++ b/manual/en/working-with-objects.txt
@@ -297,12 +297,23 @@ relations of the `User`:
         }
     }
 
+Interaction would then look like the following code parts, `$em` here is an instance of the EntityManager:
+
+    $user = $em->find('User', $userId);
+
     // unidirectional many to many
+    $comment = $em->find('Comment', $readCommentId);
     $user->getReadComments()->add($comment);
 
+    $em->flush();
+
     // unidirectional many to one
+    $myFirstComment = new Comment();
     $user->setFirstComment($myFirstComment);
 
+    $em->persist($myFirstComment);
+    $em->flush();
+
 In the case of bi-directional associations you have to update the fields on both sides:
 
     [php]
@@ -335,11 +346,17 @@ In the case of bi-directional associations you have to update the fields on both
     // Many-to-Many
     $user->getFavorites()->add($favoriteComment);
     $favoriteComment->getUserFavorites()->add($user);
+
+    $em->flush();
     
     // Many-To-One / One-To-Many Bidirectional
+    $newComment = new Comment();
     $user->getAuthoredComments()->add($newComment);
     $newComment->setAuthor($user);
 
+    $em->persist();
+    $m->flush();
+
 
 Notice how always both sides of the bidirectional association are updated. The previous unidirectional associations were simpler to handle.
 
@@ -360,6 +377,8 @@ to do so, by key and by element. Here are some examples:
     $user->getComments()->removeElement($ithComment);
     $comment->setAuthor(null);
 
+You need to call `$em->flush()` to make persist these changes in the database permanently.
+
 Notice how both sides of the bidirectional association are always updated. Unidirectional associations are consequently
 simpler to handle. Also note that if you type-hint your methods, i.e. `setAddress(Address $address)`, then PHP does only
 allows null values if `null` is set as default value. Otherwise setAddress(null) will fail for removing the association.