diff --git a/2.-Installation-guide.md b/2.-Installation-guide.md
index c4175ee..3320a28 100644
--- a/2.-Installation-guide.md
+++ b/2.-Installation-guide.md
@@ -90,6 +90,8 @@ The installation has some configuration defaults and examples. You have to edit
 - Operator-Instance App API hostname is identified by "shareeapp-operator.example.tld" and the helper hostname "shareeapp-operator1.example.tld".
 - Web-Project hostname is identified by "shareeweb-operator.example.tld" and the helper hostname "shareeweb-project1.example.tld".
 
+There is until now a restriction in the naming of the server hostnames, because to differ the kind of copri application and take the right configuration. Please keep the first part hostname, so "shareedms-" and "shareeapp-" and "shareeweb-" have to be kept.
+
 ```
 cd /exports/gitlab/copri4
 edit shareeapp-operator/apache/shareeapp-operator.conf