diff --git a/README.md b/README.md
index cd89af165..00127cc34 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 
 - Use <kbd>Ctrl</kbd> + <kbd>F</kbd> or <kbd>command</kbd> + <kbd>F</kbd> to search for a snippet.
 - Contributions welcome, please read [contribution guide](CONTRIBUTING.md).
+- Snippets are written in ES6, if you want to ensure backwards-compatibility, please use the [Babel transpiler](https://babeljs.io/).
 
 ## Contents
 
diff --git a/static-parts/README-start.md b/static-parts/README-start.md
index 424b14964..b5e4eec03 100644
--- a/static-parts/README-start.md
+++ b/static-parts/README-start.md
@@ -5,5 +5,6 @@
 
 - Use <kbd>Ctrl</kbd> + <kbd>F</kbd> or <kbd>command</kbd> + <kbd>F</kbd> to search for a snippet.
 - Contributions welcome, please read [contribution guide](CONTRIBUTING.md).
+- Snippets are written in ES6, if you want to ensure backwards-compatibility, please use the [Babel transpiler](https://babeljs.io/).
 
 ## Contents