diff --git a/src/PepperDash.Essentials.Core/Routing/TieLineConfig.cs b/src/PepperDash.Essentials.Core/Routing/TieLineConfig.cs
index 028da70a..7c09a40d 100644
--- a/src/PepperDash.Essentials.Core/Routing/TieLineConfig.cs
+++ b/src/PepperDash.Essentials.Core/Routing/TieLineConfig.cs
@@ -24,7 +24,7 @@ namespace PepperDash.Essentials.Core.Config
 		public string SourceKey { get; set; }
 		
   /// <summary>
-  /// Gets or sets the SourceCard
+  /// The key of the source card (if applicable, e.g., in a modular chassis).
   /// </summary>
 		public string SourceCard { get; set; }