diff --git a/xep-xxxx-communities.md b/xep-xxxx-communities.md
index 756481f..d0ef54f 100644
--- a/xep-xxxx-communities.md
+++ b/xep-xxxx-communities.md
@@ -140,6 +140,77 @@ have to.
```
+## State Synchronization (Maybe new XEP?)
+
+There may be some state that should be synchronized across different channels, like ban lists, ACLs, hats, and so on. To accomplish this, XEPs may define
+new [PubSub](#) nodes that supporting channels within a community should subscribe to. Upon receiving a [PubSub](#) notification, the channels should
+react appropriately in regard to the payload.
+
+Care must be taken when storing bare or full JIDs in these [PubSub](#) nodes as to not leaking them. Thus, The recommendations of
+[Persistent Storage of Private Data via PubSub](https://xmpp.org/extensions/xep-0223.html) apply.
+
+### Linking
+
+Each channel must be configured to listen to [PubSub](#) events for every bit of synchronized state it cares about. The actual mechanism for it is out of scope,
+but for MUC, it may include a field in the configuration data form that refers to the community's JID.
+
+Example:
+
+```xml
+
+
+
+
+ http://jabber.org/protocol/muc#roomconfig
+
+
+ community.example.org
+
+
+
+
+```
+
+### Banning
+
+Every channel inside a space that supports banning users, should be configured to subscribe to the `proto:urn:xmpp:community:0:ban` [PubSub](#) node. When a JID is put there,
+the supporting channels will be notified of the new ban and SHOULD apply it locally. This node MUST be configured with an access model of whitelist such that only administrators
+can see the bare JIDs of banned users.
+
+Banning a JID:
+
+```xml
+
+
+
+
+
+
+
+```
+
+### Power Levels
+
+Every channel inside a space that supports power levels, like "Moderator", "Admin", and so on, should subscribe to the `proto:urn:xmpp:community:0:power` [PubSub](#) node. Each item in it
+describes a bare JID and its power level. When a notification is received, supporting channels SHOULD keep their internal power levels in sync with the payload.
+
+Making a JID an administrator:
+
+```xml
+
+
+
+ -
+
+
+
+
+
+```
+
# Notes
- Using just this XEP, one can implement Gajim-like workspaces: Create a private community on your own bare JID and create a channel group per workspace.