diff --git a/docs/latex/wx/txrc.tex b/docs/latex/wx/txrc.tex
index 7cbcd7a532..6ab41f6c1f 100644
--- a/docs/latex/wx/txrc.tex
+++ b/docs/latex/wx/txrc.tex
@@ -148,6 +148,8 @@ Use the {\tt -c} switch to
 contain a function called {\it InitXmlResource} (unless you override this with
 a command line switch). Use it to load the resource:
 \begin{verbatim}
+  extern void InitXMLResource(); // defined in generated file
+  ...
   wxXmlResource::Get()->InitAllHandlers();
   InitXmlResource();
   ...