1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index 56de6906d0..f428158139 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -149,6 +149,8 @@ class VersionsRestServlet(RestServlet):
                             is not None
                         )
                     ),
+                    # MSC4151: Report room API (Client-Server API)
+                    "org.matrix.msc4151": self.config.experimental.msc4151_enabled,
                 },
             },
         )