diff --git a/Design:-Editor-Themes.md b/Design:-Editor-Themes.md
index 2bdcaa6..5996878 100644
--- a/Design:-Editor-Themes.md
+++ b/Design:-Editor-Themes.md
@@ -8,7 +8,7 @@ See also [issue #610](https://github.com/node-red/node-red/issues/610)
         },
         header: {
             title: "Node-RED",
-            image: "/absolute/path/to/header/image" // or null to remove image
+            image: "/absolute/path/to/header/image", // or null to remove image
             url: "http://nodered.org" // optional url to make the header text/image a link to this url
         },