diff --git a/api/api_trade.lua b/api/api_trade.lua
index 9f0e5d1..37fca5c 100644
--- a/api/api_trade.lua
+++ b/api/api_trade.lua
@@ -77,3 +77,61 @@ yl_speak_up.insert_trade_item_limitation = function( items, k, i, v )
 	end
 	items[ k ][ i ] = v
 end
+
+
+-- helper function; returns how often a trade can be done
+-- 	stock_buy	how much of the buy stack does the NPC have in storage?
+-- 	stock_pay	how much of the price stack does the NPC have in storage?
+-- 	buy_stack	stack containing the item the NPC sells
+-- 	pay_stack	stack containing the price for said item
+-- 	min_storage	how many items of the buy stack items shall the NPC keep?
+-- 	max_storage	how many items of the pay stack items can the NPC accept?
+-- used in fs_trade_via_buy_button.lua and fs_trade_list.lua
+yl_speak_up.get_trade_amount_available = function(stock_buy, stock_pay, buy_stack, pay_stack, min_storage, max_storage)
+	local stock = 0
+	-- the NPC shall not sell more than this
+	if(min_storage and min_storage > 0) then
+		stock_buy = math.max(0, stock_buy - min_storage)
+	end
+	stock = math.floor(stock_buy / buy_stack:get_count())
+	-- the NPC shall not buy more than this
+	if(max_storage and max_storage < 10000) then
+		stock_pay = math.min(max_storage - stock_pay, 10000)
+		stock = math.min(stock, math.floor(stock_pay / pay_stack:get_count()))
+	end
+	return stock
+end
+
+
+
+-- helper function; also used by fs_trade_list.lua
+yl_speak_up.get_sorted_trade_id_list = function(dialog, show_dialog_option_trades)
+	-- make sure all fields exist
+	yl_speak_up.setup_trade_limits(dialog)
+	local keys = {}
+	if(show_dialog_option_trades) then
+		for k, v in pairs(dialog.trades) do
+			if(k ~= "limits" and k ~= "" and v.d_id) then
+				table.insert(keys, k)
+			end
+		end
+	else
+		for k, v in pairs(dialog.trades) do
+			if(k ~= "limits" and k ~= "") then
+				-- structure of the indices: sell name amount for name amount
+				local parts = string.split(k, " ")
+				if(parts and #parts == 6 and parts[4] == "for"
+				  and v.pay and v.pay[1] ~= "" and v.pay[1] == parts[5].." "..parts[6]
+				  and v.buy and v.buy[1] ~= "" and v.buy[1] == parts[2].." "..parts[3]
+				  and minetest.registered_items[parts[5]]
+				  and minetest.registered_items[parts[2]]
+				  and tonumber(parts[6]) > 0
+				  and tonumber(parts[3]) > 0) then
+					table.insert(keys, k)
+				end
+			end
+		end
+	end
+	table.sort(keys)
+	return keys
+end
diff --git a/fs_edit_trade_limit.lua b/fs/fs_edit_trade_limit.lua
similarity index 100%
rename from fs_edit_trade_limit.lua
rename to fs/fs_edit_trade_limit.lua
diff --git a/fs_player_offers_item.lua b/fs/fs_player_offers_item.lua
similarity index 100%
rename from fs_player_offers_item.lua
rename to fs/fs_player_offers_item.lua
diff --git a/fs_trade_via_buy_button.lua b/fs/fs_trade_via_buy_button.lua
similarity index 87%
rename from fs_trade_via_buy_button.lua
rename to fs/fs_trade_via_buy_button.lua
index e476576..42e5dd9 100644
--- a/fs_trade_via_buy_button.lua
+++ b/fs/fs_trade_via_buy_button.lua
@@ -12,63 +12,6 @@ yl_speak_up.get_trade_item_desc = function(item)
 end
 
 
--- helper function; returns how often a trade can be done
--- 	stock_buy	how much of the buy stack does the NPC have in storage?
--- 	stock_pay	how much of the price stack does the NPC have in storage?
--- 	buy_stack	stack containing the item the NPC sells
--- 	pay_stack	stack containing the price for said item
--- 	min_storage	how many items of the buy stack items shall the NPC keep?
--- 	max_storage	how many items of the pay stack items can the NPC accept?
-yl_speak_up.get_trade_amount_available = function(stock_buy, stock_pay, buy_stack, pay_stack, min_storage, max_storage)
-	local stock = 0
-	-- the NPC shall not sell more than this
-	if(min_storage and min_storage > 0) then
-		stock_buy = math.max(0, stock_buy - min_storage)
-	end
-	stock = math.floor(stock_buy / buy_stack:get_count())
-	-- the NPC shall not buy more than this
-	if(max_storage and max_storage < 10000) then
-		stock_pay = math.min(max_storage - stock_pay, 10000)
-		stock = math.min(stock, math.floor(stock_pay / pay_stack:get_count()))
-	end
-	return stock
-end
-
-
-
--- helper function; also used by fs_trade_list.lua
-yl_speak_up.get_sorted_trade_id_list = function(dialog, show_dialog_option_trades)
-	-- make sure all fields exist
-	yl_speak_up.setup_trade_limits(dialog)
-	local keys = {}
-	if(show_dialog_option_trades) then
-		for k, v in pairs(dialog.trades) do
-			if(k ~= "limits" and k ~= "" and v.d_id) then
-				table.insert(keys, k)
-			end
-		end
-	else
-		for k, v in pairs(dialog.trades) do
-			if(k ~= "limits" and k ~= "") then
-				-- structure of the indices: sell name amount for name amount
-				local parts = string.split(k, " ")
-				if(parts and #parts == 6 and parts[4] == "for"
-				  and v.pay and v.pay[1] ~= "" and v.pay[1] == parts[5].." "..parts[6]
-				  and v.buy and v.buy[1] ~= "" and v.buy[1] == parts[2].." "..parts[3]
-				  and minetest.registered_items[parts[5]]
-				  and minetest.registered_items[parts[2]]
-				  and tonumber(parts[6]) > 0
-				  and tonumber(parts[3]) > 0) then
-					table.insert(keys, k)
-				end
-			end
-		end
-	end
-	table.sort(keys)
-	return keys
-end
-
-
 yl_speak_up.input_trade_via_buy_button = function(player, formname, fields)
 	local pname = player:get_player_name()
 
diff --git a/init.lua b/init.lua
index 62dec0c..242537c 100644
--- a/init.lua
+++ b/init.lua
@@ -212,7 +212,7 @@ yl_speak_up.reload = function(modpath, log_entry)
 	-- trade one item(stack) against one other item(stack)
 	dofile(modpath .. "trade_simple.lua")
 	-- just click on a button to buy items from the trade list
-	dofile(modpath .. "fs_trade_via_buy_button.lua")
+	dofile(modpath .. "fs/fs_trade_via_buy_button.lua")
 	-- easily accessible list of all trades the NPC offers
 	dofile(modpath .. "fs/fs_trade_list.lua")
 	-- as the name says: list which npc acesses a variable how and in which context