diff --git a/synapse/federation/sender/transaction_manager.py b/synapse/federation/sender/transaction_manager.py
index a2752a54a..8280f8b90 100644
--- a/synapse/federation/sender/transaction_manager.py
+++ b/synapse/federation/sender/transaction_manager.py
@@ -61,8 +61,6 @@ class TransactionManager(object):
         # all the edus in that transaction. This needs to be done since there is
         # no active span here, so if the edus were not received by the remote the
         # span would have no causality and it would be forgotten.
-        # The span_contexts is a generator so that it won't be evaluated if
-        # opentracing is disabled. (Yay speed!)
 
         span_contexts = []
         keep_destination = whitelisted_homeserver(destination)