diff --git a/SabreTools.Core/ArrayExtensions.cs b/SabreTools.Core/ArrayExtensions.cs
index 4de08c59..80694d4e 100644
--- a/SabreTools.Core/ArrayExtensions.cs
+++ b/SabreTools.Core/ArrayExtensions.cs
@@ -1,5 +1,6 @@
 using System;
 
+// Ported to SabreTools.Matching. Remove once published.
 namespace SabreTools.Core
 {
     public static class ArrayExtensions