diff --git a/base.nix b/base.nix
index f75bece..e5cba23 100644
--- a/base.nix
+++ b/base.nix
@@ -11,6 +11,11 @@
     };
     windowManager.xmonad.enable = true;
     windowManager.default = "xmonad";
+    monitorSection = ''
+      Modeline "3840x2160_60.00"  712.75  3840 4160 4576 5312  2160 2163 2168 2237 -hsync +vsync
+      Option "PreferredMode" "3840x2160_60.00"
+      DisplaySize 286 179    # In millimeters
+    '';
   };
 
   users.extraUsers.user = {