diff --git a/Design:-Editor-Themes.md b/Design:-Editor-Themes.md
index 8c92395..381117b 100644
--- a/Design:-Editor-Themes.md
+++ b/Design:-Editor-Themes.md
@@ -3,7 +3,7 @@ See also [issue #610](https://github.com/node-red/node-red/issues/610)
     editorTheme: {
         page: {
             title: "Node-RED",
-            favicon: "/absolute/path/to/theme/icon",
+            favicon: "/absolute/path/to/theme/icon", //can use '__dirname + "\\img\\favicon.png" (\\ on Windows)'
             css: "/absolute/path/to/custom/css/file",
             scripts: "/absolute/path/to/custom/js/file"  // As of 0.17
         },