1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index 00f29344a8..2e5d0e4e22 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -99,6 +99,8 @@ class VersionsRestServlet(RestServlet):
                     "org.matrix.msc2716": self.config.experimental.msc2716_enabled,
                     # Adds support for jump to date endpoints (/timestamp_to_event) as per MSC3030
                     "org.matrix.msc3030": self.config.experimental.msc3030_enabled,
+                    # Adds support for thread relations, per MSC3440.
+                    "org.matrix.msc3440": self.config.experimental.msc3440_enabled,
                 },
             },
         )