diff --git a/docker-compose.env.example b/docker-compose.env.example
index 911b8062..2aedbe73 100644
--- a/docker-compose.env.example
+++ b/docker-compose.env.example
@@ -32,6 +32,7 @@ SECRET_KEY_BASE=changemechangemechangeme
 # you should comment out or remove the mailhog service from docker-compose.yml,
 # too
 OSEM_EMAIL_ADDRESS=osem@mailhog
+OSEM_SMTP_AUTHENTICATION=login
 OSEM_SMTP_ADDRESS=mailhog
 OSEM_SMTP_PORT=1025
 OSEM_SMTP_USERNAME=mailhog