diff --git a/content/changelog.md b/content/changelog.md
index 238f398..1262b9e 100644
--- a/content/changelog.md
+++ b/content/changelog.md
@@ -28,6 +28,9 @@ A special thanks to the volunteer translators and testers who made this release
   - Message Rows now have draggable/animated feedback for gesture-based actions  
   - Upgrade to Flutter 2.5
   - Memory Use Improvements
+  - (Group Experiment) Previously, group signatures assumed that `Group ID` was kept secret from the server in order to preserve
+    metadata privacy. This is no longer assumed 1.2 which now only relies on `Group Key` being kept secret. This change is backwards incompatible and as such 1.1 clients will not be able to verify group messages from newer clients. For more
+    information please consult the [cwtch secure development handbook](https://docs.openprivacy.ca/cwtch-security-handbook/cwtch-overview.html#multi-party-conversations-groups-and-peer-to-server-communication)
 * **Accessibility / UX:**
   - Completed French Translation
   - References to `Peer` replaced with more specific language (e.g. `Contact` or `Conversation`) throughout the UI