diff --git a/.docker/docker-compose.yml b/.docker/docker-compose.yml
index bdf6761e09ece99ce6e70bf0baef17c60799c012..1a63292b080f182821935cb5b20b7500bfcf8f63 100644
--- a/.docker/docker-compose.yml
+++ b/.docker/docker-compose.yml
@@ -6,8 +6,6 @@ services:
       - type: volume
         source: "caosdb-sqldata"
         target: /var/lib/mysql
-      # using old short syntax here to create missing config directories
-      #- $CUSTOM_DIR/mariadb.conf.d:/etc/mysql/mariadb.conf.d:ro
     environment:
       MYSQL_ROOT_PASSWORD: caosdb1234
     networks: