diff --git a/README.md b/README.md
index fade927..2e4a844 100644
--- a/README.md
+++ b/README.md
@@ -93,3 +93,4 @@ In addition to implementing parallel computing, I am planning to incorporate use
 
 ## License
 This project is licensed under the MIT License.
+<!-- Catatan: Perubahan ini untuk latihan Pull Request dan Review -->
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diff --git a/app.py b/app.py
index 4240f27..74b53c6 100644
--- a/app.py
+++ b/app.py
@@ -19,4 +19,5 @@ def generate_flashcards():
     return jsonify(response)
 
 if __name__ == '__main__':
-    app.run()
\ No newline at end of file
+    app.run()
+    
\ No newline at end of file
diff --git a/docs/uml/classes_flashcard.png b/docs/uml/classes_flashcard.png
new file mode 100644
index 0000000..ed99568
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diff --git a/docs/uml/packages_flashcard.png b/docs/uml/packages_flashcard.png
new file mode 100644
index 0000000..fd36028
Binary files /dev/null and b/docs/uml/packages_flashcard.png differ
diff --git a/docs/uml/sequence_create_item.png b/docs/uml/sequence_create_item.png
new file mode 100644
index 0000000..273b493
Binary files /dev/null and b/docs/uml/sequence_create_item.png differ
diff --git a/docs/uml/sequence_login.png b/docs/uml/sequence_login.png
new file mode 100644
index 0000000..c72c1a1
Binary files /dev/null and b/docs/uml/sequence_login.png differ
diff --git a/uml_classes.py b/uml_classes.py
new file mode 100644
index 0000000..bcfc4e9
--- /dev/null
+++ b/uml_classes.py
@@ -0,0 +1,25 @@
+class UserModel:
+    def __init__(self):
+        self.username = ""
+        self.password = ""
+
+class UserController:
+    def __init__(self):
+        self.model = UserModel()
+
+    def login(self, username, password):
+        return self.model.username == username and self.model.password == password
+
+class Item:
+    def __init__(self, name, price):
+        self.name = name
+        self.price = price
+
+class ItemController:
+    def __init__(self):
+        self.items = []
+
+    def create_item(self, name, price):
+        item = Item(name, price)
+        self.items.append(item)
+        return item
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