diff --git a/functions.lua b/functions.lua
index a329615..e7657c9 100644
--- a/functions.lua
+++ b/functions.lua
@@ -2144,6 +2144,64 @@ minetest.register_on_player_receive_fields(
 		return
 	end
 
+	-- this way we can store the actual changes and present them to the player for saving
+	if(not(yl_speak_up.npc_was_changed[ n_id ])) then
+		yl_speak_up.npc_was_changed[ n_id ] = {}
+	end
+
+	-- change text when preconditions are met
+	if(fields.option_text_met and d_option
+	  and d_option.o_text_when_prerequisites_met ~= fields.option_text_met) then
+		-- add change to changelog
+		table.insert(yl_speak_up.npc_was_changed[ yl_speak_up.edit_mode[pname] ],
+			"Dialog "..d_id..": The text for option "..tostring(k).." was changed from \""..
+			tostring(d_option.o_text_when_prerequisites_met).."\" to \""..
+			tostring(fields.option_text_met).."\".")
+		-- actually change the text of the option
+		d_option.o_text_when_prerequisites_met = fields.option_text_met
+	end
+
+	-- change alternate text when preconditions are not met
+	if(fields.option_text_not_met and d_option
+	  and d_option.o_text_when_prerequisites_not_met ~= fields.option_text_not_met) then
+		-- add change to changelog
+		table.insert(yl_speak_up.npc_was_changed[ n_id ],
+			"Dialog "..d_id..": The alternate text for option "..tostring(k).." was changed from \""..
+			tostring(d_option.o_text_when_prerequisites_not_met).."\" to \""..
+			tostring(fields.option_text_not_met).."\".")
+		-- actually change the text of the option
+		d_option.o_text_when_prerequisites_not_met = fields.option_text_not_met
+	end
+
+	-- handle hide/grey out/show alternate answer
+	if(fields.hide_or_grey_or_alternate_answer and d_option) then
+		if(fields.hide_or_grey_or_alternate_answer == "..hide this answer."
+		  and d_option.o_hide_when_prerequisites_not_met ~= "true") then
+			d_option.o_hide_when_prerequisites_not_met = "true"
+			d_option.o_grey_when_prerequisites_not_met = "false"
+			table.insert(yl_speak_up.npc_was_changed[ n_id ],
+				"Dialog "..d_id..": If precondition for option "..tostring(k)..
+				"is not met, hide option/answer.")
+		elseif(fields.hide_or_grey_or_alternate_answer == "..grey out this answer."
+		  and d_option.o_grey_when_prerequisites_not_met ~= "true") then
+			d_option.o_hide_when_prerequisites_not_met = "false"
+			d_option.o_grey_when_prerequisites_not_met = "true"
+			table.insert(yl_speak_up.npc_was_changed[ n_id ],
+				"Dialog "..d_id..": If precondition for option "..tostring(k)..
+				"is not met, grey out option/answer.")
+		elseif(fields.hide_or_grey_or_alternate_answer == "..display the following alternate answer:"
+		  and (d_option.o_hide_when_prerequisites_not_met ~= "false"
+		    or d_option.o_grey_when_prerequisites_not_met) ~= "false") then
+			d_option.o_hide_when_prerequisites_not_met = "false"
+			d_option.o_grey_when_prerequisites_not_met = "false"
+			table.insert(yl_speak_up.npc_was_changed[ n_id ],
+				"Dialog "..d_id..": If precondition for option "..tostring(k)..
+				"is not met, show alternate option/answer.")
+		end
+	end
+
+	-- TODO: change of o_sort, change of target_dialog, button delete, buton add, (button save?)
+
 	-- back to the main dialog window?
 	if(fields.show_current_dialog or fields.quit or fields.button_exit or not(d_option)) then
 		minetest.show_formspec(pname, "yl_speak_up:talk", get_fs_talkdialog(player, n_id, d_id))