diff --git a/src/Purrse.Api/Services/ChatService.cs b/src/Purrse.Api/Services/ChatService.cs
index 154b189..ed58dca 100644
--- a/src/Purrse.Api/Services/ChatService.cs
+++ b/src/Purrse.Api/Services/ChatService.cs
@@ -650,7 +650,7 @@ public class ChatService : IChatService
         };
 
         return ("category_update", result,
-            $"Updated transaction '{updated.PayeeName ?? "Unknown"}' ({updated.Date:yyyy-MM-dd}, {updated.Amount:C}) category from '{existing.CategoryName ?? "Uncategorized"}' to '{category.Name}'.");
+            $"Updated transaction ID:{updated.Id} '{updated.PayeeName ?? "Unknown"}' ({updated.Date:yyyy-MM-dd}, {updated.Amount:C}) category from '{existing.CategoryName ?? "Uncategorized"}' to '{category.Name}'. To undo, update transaction ID:{updated.Id} back to '{existing.CategoryName ?? "Uncategorized"}'.");
     }
 
     private async Task<(string, object, string)> ExecuteListCategoriesAsync(Guid userId)