Index: Src/GoogleApis/Apis/[Media]/Download/IMediaDownloader.cs
===================================================================
--- a/Src/GoogleApis/Apis/[Media]/Download/IMediaDownloader.cs
+++ b/Src/GoogleApis/Apis/[Media]/Download/IMediaDownloader.cs
@@ -40,6 +40,10 @@
         /// Downloads asynchronously the given URL to the given stream. This download method supports a cancellation 
         /// token to cancel a request before it was completed.
         /// </summary>
+        /// In case the download fails the exception property will be set on <seealso cref="IDownloadProgress"/>, 
+        /// unless it fails because the task was canceled and the exception is 
+        /// <seealso cref="System.Threading.Tasks.TaskCanceledException"/>. In that case the exception will be thrown.
+        /// </remarks>
         Task<IDownloadProgress> DownloadAsync(string url, Stream stream, CancellationToken cancellationToken);
     }
 }