1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index f44655516e..1860006536 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -101,6 +101,9 @@ class ExperimentalConfig(Config):
         # MSC3848: Introduce errcodes for specific event sending failures
         self.msc3848_enabled: bool = experimental.get("msc3848_enabled", False)
 
+        # MSC3856: Threads list API
+        self.msc3856_enabled: bool = experimental.get("msc3856_enabled", False)
+
         # MSC3852: Expose last seen user agent field on /_matrix/client/v3/devices.
         self.msc3852_enabled: bool = experimental.get("msc3852_enabled", False)