diff --git a/README.md b/README.md
index d2c268f..00a5f06 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@ Configuration items management. Used to configure all services using a broker to
 
 Each item consists in :
 
+-   a **uuid** : a unique identifier for the configuration item
 -   a **domain** : each service is associated with one or more domains, represented by an uppercase string (eg. _USER_)
 -   a **key** : the key of the configuration item (a string)
 -   a **value** : the value of the configuration item (always a string, each service must cast the value if needed)