diff --git a/Doc/Manual/Modules.html b/Doc/Manual/Modules.html
index b9b7b2b94..1e3a8e7b1 100644
--- a/Doc/Manual/Modules.html
+++ b/Doc/Manual/Modules.html
@@ -119,6 +119,10 @@ public:
 // File: derived_module.i
 %module derived_module
 
+%{
+#include "base.h"
+%}
+
 %import "base_module.i"
 
 %inline %{
@@ -156,6 +160,10 @@ The <tt>derived_module.i</tt> file shown above could be replaced with the follow
 // File: derived_module.i
 %module derived_module
 
+%{
+#include "base.h"
+%}
+
 %import(module="base_module") "base.h"
 
 %inline %{