diff --git a/.env.dist b/.env.dist
index 8913c138131..094cc7d5cc6 100644
--- a/.env.dist
+++ b/.env.dist
@@ -8,7 +8,7 @@
 APP_ENV=prod
 APP_DEBUG=0
 #TRUSTED_PROXIES=127.0.0.1,127.0.0.2
-#TRUSTED_HOSTS=localhost,example.com
+#TRUSTED_HOSTS=^localhost$,^example\.com$
 ###< symfony/framework-bundle ###
 
 ###> doctrine/doctrine-bundle ###