1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index f44655516e..f9a49451d8 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -117,3 +117,6 @@ class ExperimentalConfig(Config):
         self.msc3882_token_timeout = self.parse_duration(
             experimental.get("msc3882_token_timeout", "5m")
         )
+
+        # MSC3874: Filtering /messages with rel_types / not_rel_types.
+        self.msc3874_enabled: bool = experimental.get("msc3874_enabled", False)