diff --git a/plan/milestone/credit.puml b/plan/milestone/credit.puml
new file mode 100644
index 0000000..879ca9c
--- /dev/null
+++ b/plan/milestone/credit.puml
@@ -0,0 +1,37 @@
+@startuml
+
+hide circle
+skinparam linetype ortho
+
+entity users_telegram {
+  id : int <<PK>>
+  first_name : longtext
+  last_name : longtext null
+  username : longtext null
+  phone_number : longtext null
+  last_update : datetime
+  --
+}
+
+entity users {
+  id : binary(40) <<PK>>
+  telegram : int <<FK>>
+  --
+  * telegram = users_telegram.id
+    on update cascade
+    on delete cascade
+}
+users ||-o| users_telegram
+
+entity credit_wallet {
+  id : binary(40) <<PK>>
+  owner : binary(40) <<FK>>
+  balance : int
+  --
+  * owner = users.id
+    on update cascade
+    on delete cascade
+}
+users ||--|| credit_wallet
+
+@enduml
\ No newline at end of file