diff --git a/asminc/tgi-mode.inc b/asminc/tgi-mode.inc
index 898164356..60425873a 100644
--- a/asminc/tgi-mode.inc
+++ b/asminc/tgi-mode.inc
@@ -34,11 +34,16 @@
 
 
 ; Graphics modes. Zero may not be used as a mode number.
-TGI_MODE_320_200_2              = 1     ; 320x200, 2 colors (b/w)
-TGI_MODE_160_200_4              = 2     ; 160x200, 4 colors
-TGI_MODE_640_200_2		= 3	; 640x200, 2 colors (b/w)
-TGI_MODE_640_480_2		= 4	; 640x480, 2 colors (b/w)
-TGI_MODE_280_192_6              = 5     ; 280x192, 6 colors
-
+.enum
+        TGI_MODE_INVALID
+        TGI_MODE_320_200_2      ; 320x200,  2 colors (b/w)
+        TGI_MODE_160_200_4      ; 160x200,  4 colors
+        TGI_MODE_640_200_2	; 640x200,  2 colors (b/w)
+        TGI_MODE_640_480_2	; 640x480,  2 colors (b/w)
+        TGI_MODE_280_192_6      ; 280x192,  6 colors
+        TGI_MODE_560_192_2      ; 560x192,  2 colors
+        TGI_MODE_40_40_16       ; 40x40,   16 colors
+.endenum
 
 
+