diff --git a/banque.md b/banque.md
index 679c3b1..38ea3e4 100644
--- a/banque.md
+++ b/banque.md
@@ -81,16 +81,16 @@ erDiagram
       text registration_numer
       date creation_date
     }
-    
+
     holder {
       bigint id PK
       int person_id FK
     }
 
-    %% Relations
+  %% Relations
 
-    person ||--o{ holder : "is held by"
-    company ||--o{ holder : "is held by"
+  person  ||--|| holder
+  company ||--|| holder
 ```
 
 ## 2. Les comptes
@@ -122,6 +122,66 @@ begin;
 commit;
 ```
 
+```mermaid
+erDiagram
+  person {
+    bigint id PK
+    text firstname
+    text lastname
+    date birthdate
+  }
+
+  company {
+    bigint id PK
+    text registration_numer
+    date creation_date
+  }
+
+  bank {
+    bigint id PK
+  }
+
+  holder {
+    bigint id PK
+    date creation_date
+  }
+
+  account {
+    bigint id PK
+    date creation_date
+    decimal balance >0
+    text currency_code FK
+  }
+
+  account_holder {
+    bigint account_id FK
+    bigint holder_id FK
+  }
+
+  transaction {
+    bigint id PK
+    date transaction_date
+    decimal amount
+  }
+
+  currency {
+    text code PK
+  }
+
+  currency {
+    text code PK
+  }
+
+  %% Relations
+
+  person  ||--|| holder
+  company ||--|| holder
+  bank    ||--|| holder
+  holder  }|--|{ account_holder
+  account_holder }|--|{ account
+
+```
+
 ## 4. Procédure stockée
 
 Pour fiabiliser le process et être sûr que l'execution s'effectue toujours dans une transaction,
diff --git a/banque.sql b/banque.sql
index 1ac2ff4..d593176 100644
--- a/banque.sql
+++ b/banque.sql
@@ -98,7 +98,6 @@ create table account (
   id bigint primary key generated always as identity,
   number text unique not null,
   opened_at date not null default current_date,
-  closed_at date,
   balance numeric(18,6) not null default 0 check (balance >= 0)
 );