diff --git a/README.md b/README.md
index 4e28774f..5d9e3a5f 100644
--- a/README.md
+++ b/README.md
@@ -929,6 +929,7 @@ If success, 200 with the list of contacts, for example:
 {
   "contacts": [
     {
+      "id": 1,
       "contact": "marketing@example.com",
       "creation_date": "2020-02-21 11:35:00+00:00",
       "creation_timestamp": 1582284900,
@@ -937,6 +938,7 @@ If success, 200 with the list of contacts, for example:
       "reverse_alias": "marketing at example.com <reply+bzvpazcdedcgcpztehxzgjgzmxskqa@sl.co>"
     },
     {
+      "id": 2,
       "contact": "newsletter@example.com",
       "creation_date": "2020-02-21 11:35:00+00:00",
       "creation_timestamp": 1582284900,
@@ -966,6 +968,7 @@ Return 409 if contact is already added.
 
 ```
 {
+  "id": 1,
   "contact": "First Last <first@example.com>",
   "creation_date": "2020-03-14 11:52:41+00:00",
   "creation_timestamp": 1584186761,
diff --git a/app/api/views/alias.py b/app/api/views/alias.py
index 25ac419f..30938cd6 100644
--- a/app/api/views/alias.py
+++ b/app/api/views/alias.py
@@ -202,6 +202,7 @@ def update_alias(alias_id):
 def serialize_contact(fe: Contact) -> dict:
 
     res = {
+        "id": fe.id,
         "creation_date": fe.created_at.format(),
         "creation_timestamp": fe.created_at.timestamp,
         "last_email_sent_date": None,