diff --git a/banque.md b/banque.md
index 49656a0..347c5bd 100644
--- a/banque.md
+++ b/banque.md
@@ -89,8 +89,8 @@ erDiagram
 
   %% Relations
 
-  person  ||--|| holder
-  company ||--|| holder
+  person  ||--|| holder :
+  company ||--|| holder :
 ```
 
 ## 2. Les comptes
@@ -149,13 +149,14 @@ erDiagram
   account {
     bigint id PK
     date creation_date
-    decimal balance >0
+    decimal balance
     text currency_code FK
   }
 
   account_holder {
     bigint account_id FK
     bigint holder_id FK
+    decimal share
   }
 
   transaction {
@@ -184,6 +185,15 @@ erDiagram
     decimal amount
   }
 
+  operation {
+    bigint id PK
+    bigint transaction_id
+    text source_account
+    text target_account
+    decimal amount
+    text direction
+  }
+
   %% Relations
 
   person  ||--|| holder :
@@ -193,6 +203,9 @@ erDiagram
   account_holder }|--|{ account :
   currency ||--|{ account :
   exchange_rate }o--|| currency :
+  transaction }o--|| operation :
+  operation }o--|| account :
+  operation }o--|| account :
 ```
 
 ## 4. Procédure stockée