diff --git a/ui/tab_b_logic.py b/ui/tab_b_logic.py
index ad16225..a1d1b35 100644
--- a/ui/tab_b_logic.py
+++ b/ui/tab_b_logic.py
@@ -53,6 +53,7 @@ DIN_GROESSEN: dict[str, tuple[int, int]] = {
     "DIN A1": (594, 841),
     "DIN A2": (420, 594),
     "DIN A3": (297, 420),
+    "DIN A4": (210, 297),
 }
 DIN_STANDARD = "DIN A0"