diff --git a/src/DynamicData/List/Change.cs b/src/DynamicData/List/Change.cs
index 9bffe6d1..179553a2 100644
--- a/src/DynamicData/List/Change.cs
+++ b/src/DynamicData/List/Change.cs
@@ -104,7 +104,7 @@ public Change(ListChangeReason reason, T current, in Optional<T> previous, int c
 
         if (reason == ListChangeReason.Refresh && currentIndex < 0)
         {
-            throw new ArgumentException("For ChangeReason.Refresh, must supply ad index");
+            throw new ArgumentException("For ChangeReason.Refresh, must supply an index");
         }
 
         Reason = reason;