diff --git a/include/xo/expression2/DefineExpr.hpp b/include/xo/expression2/DefineExpr.hpp
new file mode 100644
index 00000000..37a77c03
--- /dev/null
+++ b/include/xo/expression2/DefineExpr.hpp
@@ -0,0 +1,13 @@
+/** @file DefineExpr.hpp
+ *
+ *  @author Roland Conybeare, Feb 2026
+ **/
+
+#pragma once
+
+#include "DDefineExpr.hpp"
+#include "detail/IExpression_DDefineExpr.hpp"
+//#include "detail/IGCObject_DDefineExpr.hpp"
+#include "detail/IPrintable_DDefineExpr.hpp"
+
+/* end DefineExpr.hpp */