diff --git a/src/main.lua b/src/main.lua
index e69de29..cff9c68 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -0,0 +1,10 @@
+-- https://git.l--n.de/justuswolff/cc_housebuild/raw/branch/main/src/main.lua
+
+if not _G["turtle"] then
+    error("This program only runs on turtles!")
+end
+
+local turtle = _G["turtle"]
+
+print("fuel: "..tostring(turtle.getFuelLevel()).."/"..tostring(turtle.getFuelLimit()))
+