Merge branch 'release-v1.39' of github.com:matrix-org/synapse into matrix-org-hotfixes

1 files changed, 4 insertions, 0 deletions

diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py

index 8a1b79bd95..4826260578 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -1094,6 +1094,10 @@ class SyncHandler:
         one_time_key_counts: JsonDict = {}
         unused_fallback_key_types: List[str] = []
         if device_id:
+            # TODO: We should have a way to let clients differentiate between the states of:
+            #   * no change in OTK count since the provided since token
+            #   * the server has zero OTKs left for this device
+            #  Spec issue: https://github.com/matrix-org/matrix-doc/issues/3298
             one_time_key_counts = await self.store.count_e2e_one_time_keys(
                 user_id, device_id
             )