diff --git a/circular_saw.lua b/circular_saw.lua
index ae99e48..c910710 100644
--- a/circular_saw.lua
+++ b/circular_saw.lua
@@ -159,7 +159,7 @@ function circular_saw:update_inventory(pos, amount)
 		self:reset(pos)
 		return
 	end
-
+-- Determine the kind of stairs from either the normal block or micro block.
 	local stack = inv:get_stack("input",  1)
 	local node_name = ""
 	if stack:is_empty() then