diff --git a/docs/customization.md b/docs/customization.md
index 1dc66dfc1..85c372165 100644
--- a/docs/customization.md
+++ b/docs/customization.md
@@ -24,7 +24,7 @@ Instance description is edited during the Pleroma installation step or via admin
 Use of the Captcha feature on the registration page is configured during the Pleroma installation step or via admin configuration
 
 ## Site Logo, Brand Color, and Promo Panel List Items
-The site logo, brand color, and promo panel list items are customized by copying `soapbox.example.json` in the `static/instance` folder to `soapbox.json`.
+The site logo, brand color, and promo panel list items are customized by copying `soapbox.example.json` in the `static/instance` folder to `soapbox.json` and editing that file.  It is recommended that you test your edited soapbox.json file in a JSON validator, such as [JSONLint](https://jsonlint.com/), before using it.
 The site logo, in SVG format, is rendered to be able to allow the site theme colors to appear in the less than 100% opaque sections of the logo.
 The logo colors are rendered in a color that provides contrast for the site theme.