diff --git a/cooking.lua b/cooking.lua
index 0f4fd28..43c8331 100644
--- a/cooking.lua
+++ b/cooking.lua
@@ -1,4 +1,4 @@
-minetest.register_alias("xdecor:cauldron", "xdecor:cauldron_empty")
+minetest.register_alias("xdecor:cauldron", "xdecor:cauldron_empty") -- legacy code
 
 local cauldron_cbox = {
 	type = "fixed",
diff --git a/enchanting.lua b/enchanting.lua
index 64604bc..b8889d2 100644
--- a/enchanting.lua
+++ b/enchanting.lua
@@ -172,7 +172,6 @@ for _, tooldef in next, defs, 1 do
 for _, ench in pairs(tooldef[3]) do
 	local tool, group, material, enchant = tooldef[1], tooldef[2], mat, ench
 	local original_tool = minetest.registered_tools[mod..":"..tool.."_"..material]
-	local ceil = math.ceil
 
 	if original_tool then
 		if mod == "default" then
@@ -184,7 +183,7 @@ for _, ench in pairs(tooldef[3]) do
 			local max_drop_level = original_tool.tool_capabilities.max_drop_level
 
 			if enchant == "durable" then
-				groupcaps[group].uses = ceil(original_groupcaps[group].uses * use_factor)
+				groupcaps[group].uses = math.ceil(original_groupcaps[group].uses * use_factor)
 			elseif enchant == "fast" then
 				for i = 1, 3 do
 					groupcaps[group].times[i] = original_groupcaps[group].times[i] - times_subtractor
@@ -213,7 +212,7 @@ for _, ench in pairs(tooldef[3]) do
 
 			for armor_group, value in pairs(original_armor_groups) do
 				if enchant == "strong" then
-					armorcaps[armor_group] = ceil(value * strength_factor)
+					armorcaps[armor_group] = math.ceil(value * strength_factor)
 				elseif enchant == "speed" then
 					armorcaps[armor_group] = value
 					armorcaps.physics_speed = speed_factor
@@ -231,7 +230,8 @@ for _, ench in pairs(tooldef[3]) do
 			})
 		end
 	end
-	minetest.register_alias("xdecor:enchanted_"..tool.."_"..material.."_"..enchant, mod..":enchanted_"..tool.."_"..material.."_"..enchant)
+	minetest.register_alias("xdecor:enchanted_"..tool.."_"..material.."_"..enchant, mod..
+			":enchanted_"..tool.."_"..material.."_"..enchant) -- legacy code
 end
 end
 end
diff --git a/nodes.lua b/nodes.lua
index 584c9b8..f118a3e 100644
--- a/nodes.lua
+++ b/nodes.lua
@@ -373,7 +373,7 @@ xdecor.register("painting_1", {
 	end
 })
 
-minetest.register_alias("xdecor:painting", "xdecor:painting_1")
+minetest.register_alias("xdecor:painting", "xdecor:painting_1") -- legacy code
 
 for i = 2, 4 do
 	xdecor.register("painting_"..i, {
diff --git a/worktable.lua b/worktable.lua
index 1880b72..84c1c73 100644
--- a/worktable.lua
+++ b/worktable.lua
@@ -277,7 +277,7 @@ function worktable.fields(pos, _, fields, sender)
 		end
 		worktable.crafting(pos)
 	elseif fields.craftguide then
-		if not meta:to_table().inventory.inv_items_list then return end
+		if not meta:to_table().inventory.inv_items_list then return end -- legacy code
 		worktable.craft_output_recipe(pos, 0, 1, nil, "")
 	elseif fields.alternate then
 		inv:set_list("craft_output_recipe", {})
@@ -488,7 +488,7 @@ for _, name in pairs(n) do
 			on_place = minetest.rotate_node
 		})
 	end
-	minetest.register_alias("xdecor:"..d[1].."_"..name, mod..":"..name.."_"..d[1])
+	minetest.register_alias("xdecor:"..d[1].."_"..name, mod..":"..name.."_"..d[1]) -- legacy code
 end
 end
 end