diff --git a/doc/docker/README.md b/doc/docker/README.md
index 4f2fa9d3c5..4ed6e9ea72 100644
--- a/doc/docker/README.md
+++ b/doc/docker/README.md
@@ -5,6 +5,7 @@
 curl https://raw.githubusercontent.com/EGroupware/egroupware/master/doc/docker/docker-compose.yml > docker-compose.yml
 curl https://raw.githubusercontent.com/EGroupware/egroupware/master/doc/docker/nginx.conf > nginx.conf
 # edit docker-compose.yml or nginx.conf, by default it will run on http://localhost:8080/
+mkdir data # this is where egroupware data is stored, it's by default a subdir of the directory of docker-compose.yml
 docker-compose up -d
 ```
 ## More information
diff --git a/doc/docker/docker-compose.yml b/doc/docker/docker-compose.yml
index 9f59929c68..f00d488791 100644
--- a/doc/docker/docker-compose.yml
+++ b/doc/docker/docker-compose.yml
@@ -43,7 +43,7 @@ services:
     # MariaDB/MySQL host to use: for internal service use "db", for host database (socket bind-mounted into container) use "localhost"
     - EGW_DB_HOST=db
     # grant host is needed for NOT using localhost / unix domain socket for MySQL/MariaDB
-    - EGW_DB_GRANT_HOST="172.17.%"
+    - EGW_DB_GRANT_HOST=172.%
     # for internal db service you should to specify a root password here AND in db service
     # a database "egroupware" with a random password is created for you on installation (password is stored in header.inc.php in data directory)
     #- EGW_DB_ROOT=root