diff --git a/19.1--Installation-using-egroupware-docker-RPM-DEB-package.md b/19.1--Installation-using-egroupware-docker-RPM-DEB-package.md
index 41681ac..6951ad0 100644
--- a/19.1--Installation-using-egroupware-docker-RPM-DEB-package.md
+++ b/19.1--Installation-using-egroupware-docker-RPM-DEB-package.md
@@ -29,6 +29,7 @@ To install the EPL source / run the EPL container you need your download.egroupw
 /etc/egroupware-docker/use-epl.sh
 ```
 It will ask your EPL repo credentials, add them and the EPL image to your docker-compose.yml file and start the EPL container.
+
 ## Some more technical information what the installation is actually doing ##
 * the package will install docker, docker-compose and MariaDB-server, if not already installed
 * it will install a docker-compose file and some Apache and Nginx config files in /etc/egroupware-docker:
@@ -40,6 +41,12 @@ It will ask your EPL repo credentials, add them and the EPL image to your docker
 1. **egroupware** Ubuntu 18.04 based container with PHP 7.3 FPM and the EGroupware sources
 1. **egroupware-nginx** Alpine based container with internal Nginx server
 1. **egroupware-watchtower** automatic updating all containers to new version, if available, at 4am daily
+
+## Access to services (LDAP, IMAP, SMTP, ...) running on the host / localhost
+As EGroupware is running in a container, it's localhost is not the same as the host. So if eg. your LDAP is configured in EGroupware setup to run under **localhost** or **127.0.0.1**, you need to change that to the IP address of the host, or the hosts address on the docker0 bridge, usually 172.17.0.1.
+> To do so go to http(s)://your.host-or-ip/egroupware/setup/ and use the upper login box with the credentials from /var/lib/egroupware/egroupware-docker-install.log. 
+> Then click on [Edit current configuration] and change the LDAP host to 172.17.0.1 
+
 ## How to install third party or deprecated apps
 The following apps, which are deprecated since 14.3, are no longer part of 19.1:
 1. egroupware-epl-wiki
@@ -74,6 +81,7 @@ docker cp /var/lib/egroupware/default/loolwsd/loolwsd.conf egroupware-collabora-
 docker-compose restart
 ```
 (Please note that CODE is limited in the number of concurrent users, while our image supports the licensed number of users.)
+
 ## How to install Rocket.Chat
 After EGroupware 19.1 is installed and working, you can add Rocket.Chat by installing our **egroupware-rocketchat** package.