diff --git a/README.md b/README.md
index 175d13f..1e506d7 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,30 @@
 
 ```mermaid
 classDiagram
-Player : int id
-Player : string nom
+    class Player
+    Player : int id
+    Player : string name
+
+    class Board
+    Board : int nbrow
+    Board : int nbcol
+    Board : [] board
+    Board : _checkBoundaries(row, col)
+    Board : _removePiece(row, col)
+    Board : _insertPiece(row, col, playerId)
+    Board : insertPieceIntoColumn(col, playerId)
+
+    class Rules
+    Rules : name
+    Rules : nbrow
+    Rules : nbcol
+    Rules : checkBoardSize(board) bool
+    Rules : isFull(board) bool
+    Rules : _checkHorizontalLines(board, row, col) bool, id, winningCell
+    Rules : _checkVerticalLines()
+    Rules : _checkDiagonalNWtoSE()
+    Rules : _checkDiagonalNetoSW()
+    Rules : checkAll()
+
+    Rules ..> Board
 ```
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