diff --git a/README.md b/README.md
index 0be8d38..1dd3022 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,8 @@ Colored relief shading from Natural Earth make the low zoom levels look good.
 
 **Modify Style**
 
-You can directly modify the style with the help of the [mapbox-gl-style-editor](https://github.com/erikandre/mapbox-gl-style-editor).
+- You can directly modify the style with the help of the [mapbox-gl-style-editor](https://github.com/erikandre/mapbox-gl-style-editor).
+- Always format the Mapbox GL Style JSON with `gl-style-format` from [mapbox-gl-style-spec](https://github.com/mapbox/mapbox-gl-style-spec) first to keep a history in the style.
 
 ## Icon Design