diff --git a/SabreTools.Models/Metadata/Rom.cs b/SabreTools.Models/Metadata/Rom.cs
index 5c6b090..d33599d 100644
--- a/SabreTools.Models/Metadata/Rom.cs
+++ b/SabreTools.Models/Metadata/Rom.cs
@@ -113,6 +113,12 @@ namespace SabreTools.Models.Metadata
         /// <remarks>string; ArchiveDotOrg.File</remarks>
         public const string MatrixNumberKey = "matrix_number";
 
+        /// <remarks>string</remarks>
+        public const string MD2Key = "md2";
+
+        /// <remarks>string</remarks>
+        public const string MD4Key = "md4";
+
         /// <remarks>string</remarks>
         public const string MD5Key = "md5";