diff --git a/quest_api.lua b/quest_api.lua
index 74a7177..c985478 100644
--- a/quest_api.lua
+++ b/quest_api.lua
@@ -251,7 +251,10 @@ yl_speak_up.input_fs_manage_variables = function(player, formname, fields)
 			yl_speak_up.speak_to[pname].tmp_index_variable = index + 1
 		end
 	end
-	local var_name = var_list[ yl_speak_up.speak_to[pname].tmp_index_variable ]
+	local var_name = var_list[ yl_speak_up.speak_to[pname].tmp_index_variable - 1]
+	if(not(var_name)) then
+		var_name = ""
+	end
 
 	-- revoke read or write access to a variable
 	if(fields
@@ -404,8 +407,10 @@ yl_speak_up.get_fs_manage_variables = function(player, param)
 		additional_buttons = "button[11.4,1.9;2.5,0.9;add_variable;Create variable]"..
 			"tooltip[add_variable;Create a new varialbe with the name\n"..
 				"you entered in the field to the left.]"
+
 	else
-		local k = var_list[ yl_speak_up.speak_to[pname].tmp_index_variable ]
+		-- index 1 is "Add variable:"
+		local k = var_list[ yl_speak_up.speak_to[pname].tmp_index_variable - 1]
 		local pl_with_read_access = yl_speak_up.get_access_list_for_var(k, pname, "read_access")
 		local pl_with_write_access = yl_speak_up.get_access_list_for_var(k, pname, "write_access")
 		local add_read_button = ""
@@ -426,6 +431,43 @@ yl_speak_up.get_fs_manage_variables = function(player, param)
 					"you entered in the field to the left *write* access\n"..
 					"to your variable.]"
 		end
+		local list_of_npc_users = ""
+		local list_of_node_pos_users = ""
+		-- expand name of variable k again
+		local k_long = yl_speak_up.add_pname_to_var(k, pname)
+		-- which npc and which node_pos use this variable? create a list for display
+		local c1 = 0
+		local c2 = 0
+		if(k_long
+		  and yl_speak_up.player_vars[ k_long ]
+		  and yl_speak_up.player_vars[ k_long ][ "$META$"]) then
+			for key, v in pairs(yl_speak_up.player_vars[ k_long ][ "$META$"][
+							"used_by_npc" ] or {}) do
+				if(c1==0) then
+					list_of_npc_users = minetest.formspec_escape(key)
+				else
+					list_of_npc_users = list_of_npc_users..", "..
+						minetest.formspec_escape(key)
+				end
+				c1 = c1 + 1
+			end
+			for key, v in pairs(yl_speak_up.player_vars[ k_long ][ "$META$" ][
+							"used_by_node_pos" ] or {}) do
+				if(c2==0) then
+					list_of_node_pos_users = minetest.formspec_escape(key)
+				else
+					list_of_node_pos_users = list_of_node_pos_users..", "..
+						minetest.formspec_escape(key)
+				end
+				c2 = c2 + 1
+			end
+		end
+		if(list_of_npc_users == "") then
+			list_of_npc_users = "- none -"
+		end
+		if(list_of_node_pos_users == "") then
+			list_of_node_pos_users = "- none -"
+		end
 		additional_buttons = "button[11.4,1.9;2.5,0.9;show_var_usage;Where is it used?]"..
 			"tooltip[show_var_usage;Show which NPC use this variable in which context.]"..
 			-- offer a dropdown list and a text input field for new varialbe names for adding
@@ -458,9 +500,17 @@ yl_speak_up.get_fs_manage_variables = function(player, param)
 			"label[0.2,5.05;Type of variable: "..
 				-- TODO: show actual type
 				minetest.colorize("#FFFF00","String/text or numerical value, depending "..
-					"on how you use it")..".]"
+					"on how you use it")..".]"..
+			"label[0.2,6.05;This variable is used by the following "..
+				minetest.colorize("#FFFF00", tostring(c1)).." NPC:\n\t"..
+				-- those are only n_id - no need to formspec_escape that
+				minetest.colorize("#FFFF00", list_of_npc_users)..".]"..
+			"label[0.2,7.05;This variable is used by the following "..
+				minetest.colorize("#FFFF00", tostring(c2)).." node positions:\n\t"..
+				-- those are only pos_to_string(..) - no need to formspec_escape that
+				minetest.colorize("#FFFF00", list_of_node_pos_users)..".]"
 	end
-	return "size[14,6.5]"..
+	return "size[16,8.5]"..
 		"label[5.0,0.0;* Manage your variables *]"..
 		"label[0.2,0.8;Note: Each variable will store a diffrent value for each player who "..
 				"interacts with the NPC.\n"..
@@ -480,7 +530,7 @@ yl_speak_up.get_fs_manage_variables = function(player, param)
 		)..
 		additional_buttons..
 		"button[0.0,0.2;1.0,0.6;back;Back]"..
-		"button[6.0,6.0;1.0,0.6;back;Back]"
+		"button[6.0,8.0;1.0,0.6;back;Back]"
 end