1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index 6ebce4b2f7..37668079e7 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -12,6 +12,7 @@
 # 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
 
@@ -29,3 +30,9 @@ class ExperimentalConfig(Config):
 
         # MSC3026 (busy presence state)
         self.msc3026_enabled = experimental.get("msc3026_enabled", False)  # type: bool
+
+        # 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[RoomVersions.MSC2403.identifier] = RoomVersions.MSC2403