diff --git a/overlay/common/etc/X11/xorg.conf.d/20-hwcomposer.conf b/overlay/common/etc/X11/xorg.conf.d/20-hwcomposer.conf
index 51ecf35..4d1882a 100644
--- a/overlay/common/etc/X11/xorg.conf.d/20-hwcomposer.conf
+++ b/overlay/common/etc/X11/xorg.conf.d/20-hwcomposer.conf
@@ -1,6 +1,6 @@
 Section "Monitor"
     Identifier             "Monitor0"
-    DisplaySize            135 68    # In millimeters
+    DisplaySize            136 68    # In millimeters - see physical_height/width in kernel sources (aeon_ssd2092_fhd_dsi_solomon.c - Cosmo)
 EndSection
 
 Section "Device"