diff --git a/GITADORA-Arena-Model.md b/GITADORA-Arena-Model.md
index ab32923..31ee8eb 100644
--- a/GITADORA-Arena-Model.md
+++ b/GITADORA-Arena-Model.md
@@ -28,6 +28,8 @@ The monitor MUST support 4K@60Hz. Any smaller than that, the game will start wit
 #### Option B) fullscreen with 2 monitors (4K@60Hz main monitor + touch monitor)
 As of [#846](https://github.com/spice2x/spice2x.github.io/pull/846) you can set `-gdlayout` to `2` boot into full screen with a 4K primary monitor and a secondary touch screen, omitting the side monitors.
 
+Your touch monitor must support 800x1280 portrait (16:10 monitor, not 16:9!!!).
+
 Once in the game, go into test menu and perform touch calibration to fix your touches not lining up.
 
 #### Option C) fullscreen with 4 monitors (AC configuration)