1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index b1c1c51e4d..ba9d37553b 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersions
 from synapse.config._base import Config
 from synapse.types import JsonDict
 
@@ -25,5 +26,11 @@ class ExperimentalConfig(Config):
     def read_config(self, config: JsonDict, **kwargs):
         experimental = config.get("experimental_features") or {}
 
+        # MSC2403 (room knocking)
+        self.msc2403_enabled = experimental.get("msc2403_enabled", False)  # type: bool
+        if self.msc2403_enabled:
+            # Enable the MSC2403 unstable room version
+            KNOWN_ROOM_VERSIONS.update({RoomVersions.V7.identifier: RoomVersions.V7})
+
         # MSC2858 (multiple SSO identity providers)
         self.msc2858_enabled = experimental.get("msc2858_enabled", False)  # type: bool