diff --git a/node_modules/generator-xtc/app/templates/_config/config-default.js b/node_modules/generator-xtc/app/templates/_config/config-default.js
index <HASH>..<HASH> 100644
--- a/node_modules/generator-xtc/app/templates/_config/config-default.js
+++ b/node_modules/generator-xtc/app/templates/_config/config-default.js
@@ -26,7 +26,7 @@ module.exports = {
 		 doc            : 'Local port for the server'
 		,format         : 'port'
 		,default        : 3000
-		,env            : 'PORT'
+		,env            : 'PORT' // Heroku-style deployments require a specific env var for port: "PORT"
 		,arg            : 'port'
 	}
Add description why env var PORT needs to be exactly that.