diff --git a/Prog/OOP.md b/Prog/OOP.md
index 3ef19eb..c8e8805 100644
--- a/Prog/OOP.md
+++ b/Prog/OOP.md
@@ -1,3 +1,10 @@
+---
+​---
+author: Louis Gallet
+Date: 30/11/2023
+​---
+---
+
 # Object Oriented Programming
 
 <img src="https://i.imgur.com/qPsUYyd.jpg" alt="meme" style="zoom:50%;" />
@@ -85,4 +92,12 @@ MyFirstClass c = new MyFirstClass(); //new object
     }
     ```
 
-    
\ No newline at end of file
+## OOP - Main principles
+
+- Encapsulation
+- Abstraction
+- Inheritance (Héritage in french)
+- Polymorphism
+
+
+