diff --git a/Rocketchat-Integration.md b/Rocketchat-Integration.md
index e3ef3a5..0801242 100644
--- a/Rocketchat-Integration.md
+++ b/Rocketchat-Integration.md
@@ -23,6 +23,10 @@ Replace example.org with your full qualified domain name, and apt with yum or zy
 
 That will not only install Rocket.Chat, but also configure it to authenticate via OAuth against EGroupware.
 
+> If you missed to specify the correct domain when you installed Rocket.Chat, you can always run the installation again - ***losing your chat data of cause*** - by running the following command:
+```
+HTTP_HOST=egw.my-new-domain.org /etc/egroupware-rocketchat/install-rocketchat.sh
+```
 The following steps show the configuration process in detail.
 
 > *After installation is finished, you may want to look into some administration details e.g. to configure non-EGroupware accounts, configure Rocket.Chat to forget user session on window close (if browser is used with different EGroupware users) or to switch video-chat (Jitsi) off for GDPR reasons.*