extended README.md regarding trade list

README.md

@@ -56,8 +56,8 @@ Staff of..       does:
 ..fashion        change skin etc.
 
 Be careful: With the staffs, you can add more than one result of the type
-"dialog" or "trade" - which will confuse the NPC and lead to unexpected
-results. Use the staffs only with care!
+"dialog" - which will confuse the NPC and lead to unexpected results. Use
+the staffs only with care!
 
 Mute
 ====
@@ -109,17 +109,21 @@ The NPC can trade item(stacks) with other players.
 Only undammaged items can be traded.
 Items that contain metadata (i.e. written books, petz, ..) cannot be traded.
 Dammaged items and items containing metadata cannot be given to the NPC.
-The trade can be added through the edit options menu when talking to the NPC
-as owner.
 
 Trades can either be attached to dialog options (and show up as results there)
 via the edit options dialog or just be trades that are shown in a trade list.
-
 The trade list can be accessed from the NPC's inventory.
 
+Trades cannot be added with the staffs.
+
 If there are trades that ought to show up in the general trade list (i.e. not
-only attached to dialog options), then a button "Let's trade" will be shown
+only be attached to dialog options), then a button "Let's trade" will be shown
 as option for the first dialog.
 
 Trades that are attached to the trade list (and not dialog options) can be
 added and deleted without entering edit mode ("I am your owner. ...").
+
+If unsure where to put your trades: If your NPC wants to tell players a story
+about what he sells (or if it is i.e. a barkeeper), put your trades in the
+options of dialogs. If you just want to sell surplus items to other players
+and have the NPC act like a shop, then use the trade list.