diff --git a/Contrib/Modern UI/Readme.html b/Contrib/Modern UI/Readme.html
index 08821293..005ad22b 100644
--- a/Contrib/Modern UI/Readme.html	
+++ b/Contrib/Modern UI/Readme.html	
@@ -528,7 +528,7 @@ ReserveFile "ioFile.ini" ;Your own InstallOptions INI files
 <a name="customFunctions"></a><p class="text">If you want add your own code to functions
 inserted by the Modern UI, such as the .onGUIInit function and the Page functions,
 create your own function and let the Modern UI functions call them. Use the defines
-to define the name of your functions.</p>
+to define the name of your functions. Add the defines before the MUI_LANGUAGE macro's.</p>
 <p class="text">Example:</p>
 <pre class="text">
 !define MUI_CUSTOMFUNCTION_ONGUIINIT myGuiInit