diff --git a/MixItUp.Base/Services/External/DonorDriveService.cs b/MixItUp.Base/Services/External/DonorDriveService.cs
index 917a8c1f9..84f2980da 100644
--- a/MixItUp.Base/Services/External/DonorDriveService.cs
+++ b/MixItUp.Base/Services/External/DonorDriveService.cs
@@ -361,6 +361,9 @@ public class DonorDriveLinks
         public string stream { get; set; }
     }
 
+    /// <summary>
+    /// https://github.com/DonorDrive/PublicAPI/tree/master
+    /// </summary>
     public class DonorDriveService : IExternalService
     {
         private const string APIVersion = "1.3";