diff --git a/init.lua b/init.lua
index 5116b1c..855fb31 100644
--- a/init.lua
+++ b/init.lua
@@ -2,23 +2,10 @@
 invisibility = {}
 
 local effect_time = 180 -- 3 minutes
-
-
--- translation support
-local S
-if minetest.get_translator then
-	S = minetest.get_translator("invisibility") -- 5.x translation function
-else -- boilerplate function
-	S = function(str, ...)
-		local args = {...}
-		return str:gsub("@%d+", function(match)
-			return args[tonumber(match:sub(2))]
-		end)
-	end
-end
-
+local S = minetest.get_translator("invisibility") -- translation support
 
 -- reset player invisibility if they go offline
+
 minetest.register_on_leaveplayer(function(player)
 
 	local name = player:get_player_name()
@@ -28,15 +15,45 @@ minetest.register_on_leaveplayer(function(player)
 	end
 end)
 
-
 -- creative check
+
 local creative_mode_cache = minetest.settings:get_bool("creative_mode")
 local function is_creative(name)
 	return creative_mode_cache or minetest.check_player_privs(name, {creative = true})
 end
 
+-- invisibility function
+
+local function invisible(player, toggle)
+
+	if not player then return false end
+
+	local name = player:get_player_name()
+
+	invisibility[name] = toggle
+
+	local prop
+
+	if toggle == true then -- hide player and name tag
+
+		prop = {visual_size = {x = 0, y = 0}}
+
+		player:set_nametag_attributes({
+			color = {a = 0, r = 255, g = 255, b = 255}
+		})
+	else -- show player and tag
+		prop = {visual_size = {x = 1, y = 1}}
+
+		player:set_nametag_attributes({
+			color = {a = 255, r = 255, g = 255, b = 255}
+		})
+	end
+
+	player:set_properties(prop)
+end
 
 -- invisibility potion
+
 minetest.register_node("invisibility:potion", {
 	description = S("Invisibility Potion"),
 	drawtype = "plantlike",
@@ -66,37 +83,34 @@ minetest.register_node("invisibility:potion", {
 			return itemstack
 		end
 
-
 		-- make player invisible
 		invisible(user, true)
 
 		-- play sound
 		minetest.sound_play("pop", {
-			pos = pos, gain = 1.0, max_hear_distance = 5}, true)
+				pos = pos, gain = 1.0, max_hear_distance = 5}, true)
 
 		-- display 10 second warning
 		minetest.after(effect_time - 10, function()
 
-			if invisibility[name]
-			and user:get_pos() then
+			if invisibility[name] and user:get_pos() then
 
 				minetest.chat_send_player(name,
-					S(">>> You have 10 seconds before invisibility wears off!"))
+						S(">>> You have 10 seconds before invisibility wears off!"))
 			end
 		end)
 
 		-- make player visible 5 minutes later
 		minetest.after(effect_time, function()
 
-			if invisibility[name]
-			and user:get_pos() then
+			if invisibility[name] and user:get_pos() then
 
-				-- show aready hidden player
+				-- show hidden player
 				invisible(user, nil)
 
 				-- play sound
 				minetest.sound_play("pop", {
-					pos = pos, gain = 1.0, max_hear_distance = 5}, true)
+						pos = pos, gain = 1.0, max_hear_distance = 5}, true)
 			end
 		end)
 
@@ -128,58 +142,20 @@ minetest.register_node("invisibility:potion", {
 	end
 })
 
-
 -- craft recipe
+
 minetest.register_craft( {
 	output = "invisibility:potion",
 	type = "shapeless",
 	recipe = {
-		"default:sapling", "default:junglesapling",
-		"default:pine_sapling", "default:acacia_sapling",
-		"default:aspen_sapling", "default:bush_sapling",
-		"default:acacia_bush_sapling",
-		"vessels:glass_bottle", "flowers:mushroom_red",
+		"default:sapling", "default:junglesapling", "default:pine_sapling",
+		"default:acacia_sapling", "default:aspen_sapling", "default:bush_sapling",
+		"default:acacia_bush_sapling", "vessels:glass_bottle", "flowers:mushroom_red"
 	}
 })
 
-
--- invisibility function
-invisible = function(player, toggle)
-
-	if not player then return false end
-
-	local name = player:get_player_name()
-
-	invisibility[name] = toggle
-
-	local prop
-
-	if toggle == true then
-
-		-- hide player and name tag
-		prop = {
-			visual_size = {x = 0, y = 0}
-		}
-
-		player:set_nametag_attributes({
-			color = {a = 0, r = 255, g = 255, b = 255}
-		})
-	else
-		-- show player and tag
-		prop = {
-			visual_size = {x = 1, y = 1}
-		}
-
-		player:set_nametag_attributes({
-			color = {a = 255, r = 255, g = 255, b = 255}
-		})
-	end
-
-	player:set_properties(prop)
-end
-
-
 -- vanish command (admin only)
+
 minetest.register_chatcommand("vanish", {
 	params = "<name>",
 	description = "Make player invisible",
@@ -188,8 +164,7 @@ minetest.register_chatcommand("vanish", {
 	func = function(name, param)
 
 		-- player online
-		if param ~= ""
-		and minetest.get_player_by_name(param) then
+		if param ~= "" and minetest.get_player_by_name(param) then
 
 			name = param
 
diff --git a/mod.conf b/mod.conf
index 0f9cd0b..4e44c2b 100644
--- a/mod.conf
+++ b/mod.conf
@@ -1,4 +1,4 @@
 name = invisibility
-depends = default, vessels, flowers
-optional_depends =
 description = Craft a potion to make yourself invisible.
+depends = default
+min_minetest_version = 5.0