diff --git a/src/devices/screen.c b/src/devices/screen.c
index dd26cab..e39bc38 100644
--- a/src/devices/screen.c
+++ b/src/devices/screen.c
@@ -16,6 +16,8 @@ WITH REGARD TO THIS SOFTWARE.
 
 UxnScreen uxn_screen;
 
+/* c = !ch ? (color % 5 ? color >> 2 : 0) : color % 4 + ch == 1 ? 0 : (ch - 2 + (color & 3)) % 3 + 1; */
+
 static Uint8 blending[4][16] = {
 	{0, 0, 0, 0, 1, 0, 1, 1, 2, 2, 0, 2, 3, 3, 3, 0},
 	{0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3},