diff --git a/tests/SIGCM2.Api.Tests/ProductTypes/ProductTypesControllerTests.cs b/tests/SIGCM2.Api.Tests/ProductTypes/ProductTypesControllerTests.cs
index f8104cf..8ddc743 100644
--- a/tests/SIGCM2.Api.Tests/ProductTypes/ProductTypesControllerTests.cs
+++ b/tests/SIGCM2.Api.Tests/ProductTypes/ProductTypesControllerTests.cs
@@ -227,6 +227,10 @@ public sealed class ProductTypesControllerTests : IAsyncLifetime
 
     // ── DELETE /api/v1/admin/product-types/{id} ───────────────────────────────
 
+    // TODO PRD-002: agregar e2e test para DELETE → 409 cuando IProductQueryRepository.IsInUseAsync retorna true.
+    // Bloqueado por W1 (RSA singleton sealed en TestWebApplicationFactory). Ref issue #36.
+    // Coverage compositional actual: DeactivateProductTypeCommandHandlerTests (unit) + ExceptionFilterTests (unit → 409).
+
     [Fact]
     public async Task Deactivate_NotFound_Returns404()
     {