diff --git a/docs/erd.puml b/docs/erd.puml
index eef2e3c..da3ae02 100644
--- a/docs/erd.puml
+++ b/docs/erd.puml
@@ -165,8 +165,9 @@ acl_p::pool_id }o--|| pool::id
 ' ========== ACTIVITY ==========
 
 entity "activity.sessions" as ssn {
-    * id : uuid <<generated>>
+    * id : serial <<generated>>
     --
+    * token : text
     * user_id : smallint
     * user_agent : varchar(512)
     * started_at : timestamptz