diff --git a/Contrib/Modern UI/Readme.html b/Contrib/Modern UI/Readme.html
index 4c1470e5..e5c7af29 100644
--- a/Contrib/Modern UI/Readme.html	
+++ b/Contrib/Modern UI/Readme.html	
@@ -373,6 +373,8 @@ parameters.</p>
 !define MUI_BRANDINGTEXT "French Branding Text"
 !insertmacro MUI_LANGUAGE "French"
 </pre>
+  <p class="text"><span class="bold">Note: </span>When using different product name (MUI_PRODUCT)
+  for different languges, !undef MUI_PRODUCT after inserting a language file.</p>
   <p class="text">Have a look at the language files for a complete list of all the
   string names.</p>
   <p class="text">You can customize texts that can be set in the Classic UI using the LicenseText,