diff --git a/YahooAuctionsItem.cs b/YahooAuctionsItem.cs
index 2bedee8..4601dc0 100644
--- a/YahooAuctionsItem.cs
+++ b/YahooAuctionsItem.cs
@@ -8,12 +8,14 @@ using CsvHelper.Configuration.Attributes;
 
 namespace Buypeeb {
 	class YahooAuctionsItem {
+		[JsonIgnore]
 		public string url {
 			get {
 				return $"https://page.auctions.yahoo.co.jp/jp/auction/{this.id}";
 			}
 		}
 
+		[JsonIgnore]
 		public string buyeeUrl {
 			get {
 				return $"https://buyee.jp/item/yahoo/auction/{this.id}";
@@ -25,6 +27,7 @@ namespace Buypeeb {
 		// the id *must* be saved!
 		// i'm also saving the original name to make it easier to tell what the items are in the userdata.json
 		// there's not really a need for it i guess but it's my program and i can do what i want
+		// anything with the attribute [Ignore] won't be put in the CSV, and things with [JsonIgnore] won't be put in userdata.json
 		[Ignore]
 		public string id { get; set; }
 		public string name { get; set; }