diff --git a/helpers/environment.js b/helpers/environment.js
index 40a210f..f79fe59 100644
--- a/helpers/environment.js
+++ b/helpers/environment.js
@@ -4,6 +4,7 @@ import path from 'path'
 
 export const isProduction = process.env.NODE_ENV === 'PRODUCTION'
 
+// https://docs.netlify.com/configure-builds/environment-variables/#build-metadata
 export const isNetlify = process.env.NETLIFY === true
 
 export const rootDir = path.resolve(__dirname, '../')