diff --git a/omemo/README.md b/omemo/README.md
index 8b1095cf40dfc3fbe20f3a61a795e333dac94159..e801453c61b00c3d9928b0716c4d2d520a5f75ea 100644
--- a/omemo/README.md
+++ b/omemo/README.md
@@ -57,6 +57,13 @@ you have to trust at least **one** fingerprint to send messages.
 you can receive messages from fingerprints where you didnt made a trust decision, but you cant
 receive Messages from *not trusted* fingerprints
 
+## Groupchat
+
+Groupchat works only in rooms that are
+- non-anonymous
+- members-only
+- works only with contacts that you have in your roster
+
 ## Filetransfer
 
 For Filetransfer use the **httpupload** plugin.