diff --git a/init.lua b/init.lua
index 3625568..7642763 100644
--- a/init.lua
+++ b/init.lua
@@ -1,3 +1,4 @@
+-- trampoline nodebox
 local trampolinebox = {
 	type = "fixed",
 	fixed = {
@@ -10,6 +11,7 @@ local trampolinebox = {
 		}
 }
 
+-- cushion nodebox
 local cushionbox = {
 	type = "fixed",
 	fixed = {
@@ -17,16 +19,27 @@ local cushionbox = {
 		}
 }
 
+-- left click: update trampoline to increase power level
 local trampoline_punch = function(pos, node)
-	local id = string.sub(node.name, #node.name)
-	local meta = minetest.get_meta(pos)
+	local id = string.sub(node.name, #node.name) -- get node "id"
+	local meta = minetest.get_meta(pos) -- get meta access
 	if id < "6" then
-		id = id + 1
-		minetest.add_node(pos, {name = string.sub(node.name, 1, #node.name - 1)..id})
-		meta:set_string("infotext", "Power Level: "..id)
+		id = id + 1 -- set id one value higher
+		minetest.add_node(pos, {name = string.sub(node.name, 1, #node.name - 1)..id}) -- update trampoline node
+		meta:set_string("infotext", "Power Level: "..id) -- set infotext
 	end
 end
 
+-- right click: update trampoline to decrease power level
+local power_decrease = function(pos, node)
+	local id = string.sub(node.name, #node.name) -- get node "id"
+	local meta = minetest.get_meta(pos) -- get meta access
+	id = id - 1 -- set id one value lower
+	minetest.add_node(pos, {name = string.sub(node.name, 1, #node.name - 1)..id}) -- update trampoline node
+	meta:set_string("infotext", "Power Level: "..id) -- set infotext
+end
+
+-- register trampolines of power level 2-6
 for i = 2, 6 do
 	minetest.register_node("jumping:trampoline"..i, {
 		description = "Trampoline",
@@ -34,13 +47,11 @@ for i = 2, 6 do
 		node_box = trampolinebox,
 		selection_box = trampolinebox,
 		paramtype = "light",
-		on_punch = trampoline_punch,
-		on_rightclick = function(pos, node)
-			local id = string.sub(node.name, #node.name)
+		on_punch = trampoline_punch, -- on punch (left click) increase poser lever
+		on_rightclick = power_decrease,
+		on_construct = function(pos) -- set meta data on place
 			local meta = minetest.get_meta(pos)
-			id = id - 1
-			minetest.add_node(pos, {name = string.sub(node.name, 1, #node.name - 1)..id})
-			meta:set_string("infotext", "Power Level: "..id)
+			meta:set_string("infotext", "Power Level: "..i)
 		end,
 		drop = "jumping:trampoline1",
 		tiles = {
@@ -52,6 +63,7 @@ for i = 2, 6 do
 	})
 end
 
+-- register trampoline power level 1
 minetest.register_node("jumping:trampoline1", {
 	description = "Trampoline",
 	drawtype = "nodebox",
@@ -59,7 +71,7 @@ minetest.register_node("jumping:trampoline1", {
 	selection_box = trampolinebox,
 	paramtype = "light",
 	on_punch = trampoline_punch,
-	on_construct = function(pos)
+	on_construct = function(pos) -- set meta data on place
 		local meta = minetest.get_meta(pos)
 		meta:set_string("infotext", "Power Level: 1")
 	end,
@@ -71,6 +83,7 @@ minetest.register_node("jumping:trampoline1", {
 	groups = {dig_immediate=2, bouncy=20+1*20, fall_damage_add_percent=-70},
 })
 
+-- register cushion
 minetest.register_node("jumping:cushion", {
 	description = "Cushion",
 	drawtype = "nodebox",
@@ -85,6 +98,7 @@ minetest.register_node("jumping:cushion", {
 	groups = {dig_immediate=2, disable_jump=1, fall_damage_add_percent=-100},
 })
 
+-- register recipe for trampoline (power lever 1)
 minetest.register_craft({
 	output = "jumping:trampoline1",
 	recipe = {
@@ -94,6 +108,7 @@ minetest.register_craft({
 	}
 })
 
+-- register recipe for cushion
 minetest.register_craft({
 	output = "jumping:cushion",
 	recipe = {