diff --git a/tests/ZB.MOM.WW.ScadaBridge.NotificationService.Tests/Ews/EwsResponseParserTests.cs b/tests/ZB.MOM.WW.ScadaBridge.NotificationService.Tests/Ews/EwsResponseParserTests.cs
index c60d8994..2c5c82da 100644
--- a/tests/ZB.MOM.WW.ScadaBridge.NotificationService.Tests/Ews/EwsResponseParserTests.cs
+++ b/tests/ZB.MOM.WW.ScadaBridge.NotificationService.Tests/Ews/EwsResponseParserTests.cs
@@ -116,8 +116,9 @@ public class EwsResponseParserTests
     public void Parse_PayloadWithDtdEntityDeclaration_IsRejectedAsUnparseable()
     {
         // Pins DTD-prohibited parsing (XXE guard). The response body is external input, so the
-        // parser must never process a DOCTYPE. XDocument.Parse prohibits DTDs by default; a
-        // refactor that supplies XmlReaderSettings with a looser DtdProcessing fails here.
+        // parser must never process a DOCTYPE. LINQ-to-XML does NOT prohibit DTDs on its own, so
+        // the parser reads through an XmlReader pinned to DtdProcessing.Prohibit with a null
+        // resolver; a refactor that loosens either setting fails here.
         //
         // The payload is deliberately a well-formed EWS response so the assertion has teeth: with
         // DTDs prohibited the DOCTYPE itself throws and the body is Unparseable, whereas any