diff --git a/Calc1/ShuntYard.cs b/Calc1/ShuntYard.cs
index d70430a..9049a8d 100644
--- a/Calc1/ShuntYard.cs
+++ b/Calc1/ShuntYard.cs
@@ -66,6 +66,7 @@ class ShuntYard
         };
         public static Tuple<List<RpnModel>,string> ShuntRpnModel(List<string> input)
         {
+            //why didn't you add comments to this.
             var op = new Stack<OperatorPrecedence>();
             var rpn = new List<RpnModel>();
             var errorMessage = string.Empty;