diff --git a/README.md b/README.md
index b026b2a..8b39fef 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,3 @@
 # LF5 Database Project
+
+![img](./poster/dbms.png)
\ No newline at end of file
diff --git a/erd.dbml b/erd.dbml
index 0f71f4e..d60ae40 100644
--- a/erd.dbml
+++ b/erd.dbml
@@ -16,7 +16,7 @@ Table Customer {
 
 Table Order {
   id string [primary key]
-  customer Customer
+  customer_id string
   invoice_amount integer
   order_date timestamp
 }
@@ -70,7 +70,7 @@ Table OrderContainsIngredients {
   quantity integer
 }
 
-Ref: Order.customer > Customer.id
+Ref: Order.customer_id > Customer.id
 Ref: SupplierContainsIngredients.supplier > Supplier.id
 Ref: SupplierContainsIngredients.ingredient > Ingredient.id
 Ref: OrderContainsIngredients.order > Order.id
diff --git a/lib/datatypes.py b/lib/datatypes.py
index 06d62d7..68239ef 100644
--- a/lib/datatypes.py
+++ b/lib/datatypes.py
@@ -21,7 +21,7 @@ class Customer:
 @dataclass
 class Order:
     id: str
-    customer: Customer.id
+    customer_id: Customer.id
     invoice_amount: int
     order_date: str  # Assuming timestamp as a string for simplicity
 
diff --git a/poster/dbms.png b/poster/dbms.png
new file mode 100644
index 0000000..c224de1
Binary files /dev/null and b/poster/dbms.png differ