diff --git a/sapp/ui/server.py b/sapp/ui/server.py
index f158dedd..7d735488 100644
--- a/sapp/ui/server.py
+++ b/sapp/ui/server.py
@@ -36,6 +36,9 @@
 session: Optional[Session] = None
 
 
+# pyre-fixme[56]: While applying decorator `application.teardown_request`: For 1st
+#  argument expected `T_teardown` but got `(exception: Optional[Exception] = ...) ->
+#  None`.
 @application.teardown_request
 def shutdown_session(exception: Optional[Exception] = None) -> None:
     if session is not None: