diff --git a/src/Data.Xml/XmlIO/Write/XmlInsert.cs b/src/Data.Xml/XmlIO/Write/XmlInsert.cs
index 557a914..c27d04d 100644
--- a/src/Data.Xml/XmlIO/Write/XmlInsert.cs
+++ b/src/Data.Xml/XmlIO/Write/XmlInsert.cs
@@ -9,6 +9,9 @@ public XmlInsert(Common.FileStatements.FileInsert fileStatement, FileConnection<
     {
     }
 
+    // Always true: XML schema may or may not come from an XSD file, but the property
+    // doesn't have table context to check. RealizeSchema handles this by returning early
+    // when columns are already defined (e.g. from XSD or CREATE TABLE).
     public override bool SchemaUnknownWithoutData => true;
 
     protected override void RealizeSchema(DataTable dataTable)