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-rw-r--r--changelog.d/15678.misc1
-rw-r--r--synapse/api/room_versions.py1
2 files changed, 2 insertions, 0 deletions
diff --git a/changelog.d/15678.misc b/changelog.d/15678.misc
new file mode 100644
index 0000000000..92eae49952
--- /dev/null
+++ b/changelog.d/15678.misc
@@ -0,0 +1 @@
+Implement "option 2" for [MSC3820](https://github.com/matrix-org/matrix-spec-proposals/pull/3820): Room version 11.
\ No newline at end of file
diff --git a/synapse/api/room_versions.py b/synapse/api/room_versions.py
index 035a14171b..c5c71e242f 100644
--- a/synapse/api/room_versions.py
+++ b/synapse/api/room_versions.py
@@ -528,6 +528,7 @@ KNOWN_ROOM_VERSIONS: Dict[str, RoomVersion] = {
         RoomVersions.V10,
         RoomVersions.MSC2716v4,
         RoomVersions.MSC3989,
+        RoomVersions.MSC3820opt2,
     )
 }