diff --git a/inventory.lua b/inventory.lua
index 0e0ad5d..ebb4961 100644
--- a/inventory.lua
+++ b/inventory.lua
@@ -84,17 +84,28 @@ yl_speak_up.load_npc_inventory = function(n_id)
 				return 0
 			end
 			return stack:get_count()
-		end
+		end,
 	        -- Called when a player wants to take something out of the inventory.
 	        -- Return value: number of items allowed to take.
 	        -- Return value -1: Allow and don't modify item count in inventory.
 
---	        on_move = function(inv, from_list, from_index, to_list, to_index, count, player) end,
---	        on_put = function(inv, listname, index, stack, player) end,
---	        on_take = function(inv, listname, index, stack, player) end,
-	        -- Called after the actual action has happened, according to what was
-	        -- allowed.
-	        -- No return value.
+		-- log inventory changes (same way as modifications to chest inventories)
+	        on_move = function(inv, from_list, from_index, to_list, to_index, count, player)
+			minetest.log("action", player:get_player_name() ..
+				" moves stuff in inventory of NPC " .. tostring(n_id))
+
+		end,
+	        on_put = function(inv, listname, index, stack, player)
+			minetest.log("action", player:get_player_name() ..
+				" moves " .. stack:get_name() ..
+				" to inventory of NPC " .. tostring(n_id))
+
+		end,
+	        on_take = function(inv, listname, index, stack, player)
+			minetest.log("action", player:get_player_name() ..
+				" takes " .. stack:get_name() ..
+				" from inventory of NPC " .. tostring(n_id))
+		end,
 	})
 	-- the NPC needs enough room for trade items, payment and questitems
 	npc_inv:set_size("npc_main", 6*12)