1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index c21b7eb37e..bae9cc8047 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -140,6 +140,12 @@ class MSC3861:
                 ("experimental", "msc3861", "client_auth_method"),
             )
 
+    introspection_endpoint: Optional[str] = attr.ib(
+        default=None,
+        validator=attr.validators.optional(attr.validators.instance_of(str)),
+    )
+    """The URL of the introspection endpoint used to validate access tokens."""
+
     account_management_url: Optional[str] = attr.ib(
         default=None,
         validator=attr.validators.optional(attr.validators.instance_of(str)),