diff --git a/digroom.lua b/digroom.lua
index 981a4cf..bfa0cd3 100644
--- a/digroom.lua
+++ b/digroom.lua
@@ -1,14 +1,18 @@
--- local coordinates!
 local tArgs = { ... }
-local x = tArgs[1]
-local y = tArgs[2]
-local z = tArgs[3]
-local fuel = 16
+if table.maxn(tArgs) ~= 3 then
+    print("This program digs a room in front of the turtle to the right.")
+    print("Arguments: width, length, height.")
+    return
+end
+local width = tArgs[1]
+local length = tArgs[2]
+local height = tArgs[3]
 local up = true
 local fw = false
+print("Digging room with", width, "width,", length, "length and", height, "height.")
 
 local function digUp()
-    for i = 2, z do
+    for i = 2, height do
         while not turtle.up() do
             turtle.digUp()
         end
@@ -16,7 +20,7 @@ local function digUp()
 end
 
 local function digDown()
-    for i = 2, z do
+    for i = 2, height do
         while not turtle.down() do
             turtle.digDown()
         end
@@ -40,25 +44,26 @@ end
 
 local function turn()
     if fw then
-        turtle.turnRight()
-    else
         turtle.turnLeft()
+    else
+        turtle.turnRight()
     end
 end
 
 local function refuel()
-    if turtle.getFuelLevel() <= 4 * z then
+    if turtle.getFuelLevel() <= 4 * height then
         if not turtle.refuel() then
             print("No fuel!")
         end
     end
 end
 
-for i = 1, x do
+refuel()
+for i = 1, width do
     digFw()
     turn()
     fw = not fw
-    for j = 2, y do
+    for j = 2, length do
         digVertical()
         digFw()
         refuel()