diff --git a/docs/advanced.md b/docs/advanced.md
index d08fdff6..8eb44bd0 100644
--- a/docs/advanced.md
+++ b/docs/advanced.md
@@ -90,7 +90,7 @@ using Microsoft.Extensions.Logging;
 
 namespace CSnakes.Runtime;
 
-public class ExampleDirectIntegration
+public sealed class ExampleDirectIntegration : IDisposable
 {
     private readonly PyObject module;