diff --git a/BurnOutSharp/PackerType/UPX.cs b/BurnOutSharp/PackerType/UPX.cs
index 68c020c1..47e2c807 100644
--- a/BurnOutSharp/PackerType/UPX.cs
+++ b/BurnOutSharp/PackerType/UPX.cs
@@ -9,6 +9,7 @@ using BurnOutSharp.Matching;
 namespace BurnOutSharp.PackerType
 {
     // TODO: Add extraction
+    // https://raw.githubusercontent.com/wolfram77web/app-peid/master/userdb.txt
     public class UPX : IPortableExecutableCheck, IScannable
     {
         /// <inheritdoc/>