1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index 4e1fd2bbe7..4b87ee978a 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -114,6 +114,8 @@ class VersionsRestServlet(RestServlet):
                     "org.matrix.msc3882": self.config.experimental.msc3882_enabled,
                     # Adds support for remotely enabling/disabling pushers, as per MSC3881
                     "org.matrix.msc3881": self.config.experimental.msc3881_enabled,
+                    # Adds support for filtering /messages by event relation.
+                    "org.matrix.msc3874": self.config.experimental.msc3874_enabled,
                 },
             },
         )