1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index c9b9e7f5ff..54eed3251b 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -84,6 +84,8 @@ class VersionsRestServlet(RestServlet):
                     "io.element.e2ee_forced.public": self.e2ee_forced_public,
                     "io.element.e2ee_forced.private": self.e2ee_forced_private,
                     "io.element.e2ee_forced.trusted_private": self.e2ee_forced_trusted_private,
+                    # Supports the busy presence state described in MSC3026.
+                    "org.matrix.msc3026.busy_presence": self.config.experimental.msc3026_enabled,
                 },
             },
         )