diff --git a/init.lua b/init.lua
index 1a0bd47..dbf1d1d 100644
--- a/init.lua
+++ b/init.lua
@@ -1,5 +1,23 @@
 tga_encoder = {}
 
+tga_encoder.features = {}
+tga_encoder.features.color_format = {
+	"A1R5G5B5",
+	"B8G8R8",
+	"B8G8R8A8",
+	"Y8",
+}
+tga_encoder.features.colormap = {
+}
+tga_encoder.features.compression = {
+	"RAW",
+	"RLE",
+}
+tga_encoder.features.scanline_order = {
+	"bottom-top",
+	"top-bottom",
+}
+
 local image = setmetatable({}, {
 	__call = function(self, ...)
 		local t = setmetatable({}, {__index = self})