diff --git a/README.md b/README.md
index 878c22f..4365531 100644
--- a/README.md
+++ b/README.md
@@ -274,6 +274,11 @@ NPC, inventory movements and purchases are logged.
 The log shows the date but not the time of the action. Players can view the
 logs of their own NPC.
 
+If you want to keep an NPC from logging, set the property
+	server_nolog_effects	to i.e	"true"
+That way, the NPC will no longer log or send debug messages when executing
+effects.
+
 
 ### 13. Quest items
 <a name="quest-items"></a>
diff --git a/exec_apply_effects.lua b/exec_apply_effects.lua
index a4e9fdc..bdbd421 100644
--- a/exec_apply_effects.lua
+++ b/exec_apply_effects.lua
@@ -70,16 +70,24 @@ yl_speak_up.execute_all_relevant_effects = function(player, effects, o_id, actio
 	local last_result = action_was_successful
 	local res = true
 	local refuse_items = true
+	local properties = yl_speak_up.get_npc_properties(pname)
+	local no_log = properties["server_nolog_effects"]
 	for i, k in ipairs(sorted_key_list) do
 		local r = effects[ k ]
 		yl_speak_up.debug_msg(player, n_id, o_id, "..executing "..
 			tostring(r.r_id)..": "..yl_speak_up.show_effect(r, pname))
 		-- do not execute effects in edit mode
 		if(not(edit_mode)) then
-			yl_speak_up.debug_msg(player, n_id, o_id,
-				"Executing effect "..tostring(r.r_id)..".")
+			if(not(no_log)) then
+				yl_speak_up.debug_msg(player, n_id, o_id,
+					"Executing effect "..tostring(r.r_id)..".")
+			end
 			res = yl_speak_up.execute_effect(player, n_id, o_id, r)
-			if(not(res)) then
+			if(no_log) then
+				if(not(res)) then
+					alternate_text = r.alternate_text
+				end
+			elseif(not(res)) then
 				yl_speak_up.debug_msg(player, n_id, o_id, tostring(r.r_id)..
 					" -> Effect failed to execute.")
 				if(r.r_type ~= "dialog") then