diff --git a/Turtle/Turtle.lua b/Turtle/Turtle.lua
index 4f36d2d..e9f001b 100644
--- a/Turtle/Turtle.lua
+++ b/Turtle/Turtle.lua
@@ -5,4 +5,24 @@ function Turtle:new(t)
     setmetatable(t, self)
     self.__index = self
     return t
+end
+
+function Turtle:updateInv()
+    self.inv = {}
+    for slot = 1, 16 do
+        self.inv[slot] = turtle.getItemDetail(slot, true)
+    end
+end
+
+function Turtle:assertInvUpdate(update)
+    if (update ~= false) then update = true end
+
+    if self.inv == nil then
+        update = true
+    end
+
+    assert(type(update) == "boolean","update must be of the type boolean")
+    if update == true then
+        self:updateInv()
+    end
 end
\ No newline at end of file