diff --git a/examples/IsNullOrEmpty.Example/Program.cs b/examples/IsNullOrEmpty.Example/Program.cs
index a7d45e0..99d57ad 100644
--- a/examples/IsNullOrEmpty.Example/Program.cs
+++ b/examples/IsNullOrEmpty.Example/Program.cs
@@ -20,7 +20,7 @@
 Console.WriteLine();
 
 // Practical example: guard clause in a method
-ProcessOrders(null);
+ProcessOrders(orders: null);
 ProcessOrders(Array.Empty<Order>());
 ProcessOrders(new[] { new Order("ORD-001", 29.99m), new Order("ORD-002", 49.99m) });
 
diff --git a/src/Wolfgang.Extensions.IEnumerable/IEnumerableExtensions.cs b/src/Wolfgang.Extensions.IEnumerable/IEnumerableExtensions.cs
index dbe531e..38f71c1 100644
--- a/src/Wolfgang.Extensions.IEnumerable/IEnumerableExtensions.cs
+++ b/src/Wolfgang.Extensions.IEnumerable/IEnumerableExtensions.cs
@@ -60,6 +60,7 @@ public static void ForEach<T>(this IEnumerable<T>? source, Action<T> action)
     /// <returns>
     /// true if the source sequence contains no elements; otherwise, false.
     /// </returns>
+    /// <exception cref="ArgumentNullException">source is null.</exception>
     /// <example>
     /// <code>
     /// var items = new List&lt;string&gt;();