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-rw-r--r--synapse/federation/transaction_queue.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/federation/transaction_queue.py b/synapse/federation/transaction_queue.py
index 4f8315e59d..1898e4b44b 100644
--- a/synapse/federation/transaction_queue.py
+++ b/synapse/federation/transaction_queue.py
@@ -70,6 +70,7 @@ class TransactionQueue(object):
         # destination -> list of tuple(edu, deferred)
         self.pending_edus_by_dest = edus = {}
 
+        # Presence needs to be separate as we send single aggragate EDUs
         self.pending_presence_by_dest = presence = {}
         self.pending_edus_keyed_by_dest = edus_keyed = {}