diff --git a/AutoTx/RoboCommand.cs b/AutoTx/RoboCommand.cs
index 443282c3a35a2a614ee64f5394ac86803619d786..cb9dc03010bceded7f0d9509b36feeb6827abb1c 100644
--- a/AutoTx/RoboCommand.cs
+++ b/AutoTx/RoboCommand.cs
@@ -17,6 +17,7 @@ namespace AutoTx
         /// false. The currently processed path is stored in the global status
         /// variable CurrentTransferSrc.
         /// </summary>
+        /// <param name="sourcePath">The full path to a folder.</param>
         private void StartTransfer(string sourcePath) {
             // only proceed when in a valid state:
             if (_transferState != TxState.Stopped)