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-rw-r--r--synapse/visibility.py6
1 files changed, 4 insertions, 2 deletions
diff --git a/synapse/visibility.py b/synapse/visibility.py
index 9abbaa5a64..c810a05907 100644
--- a/synapse/visibility.py
+++ b/synapse/visibility.py
@@ -23,6 +23,7 @@ from synapse.api.constants import EventTypes, HistoryVisibility, Membership
 from synapse.events import EventBase
 from synapse.events.snapshot import EventContext
 from synapse.events.utils import prune_event
+from synapse.logging.opentracing import trace
 from synapse.storage.controllers import StorageControllers
 from synapse.storage.databases.main import DataStore
 from synapse.storage.state import StateFilter
@@ -51,6 +52,7 @@ MEMBERSHIP_PRIORITY = (
 _HISTORY_VIS_KEY: Final[Tuple[str, str]] = (EventTypes.RoomHistoryVisibility, "")
 
 
+@trace
 async def filter_events_for_client(
     storage: StorageControllers,
     user_id: str,
@@ -71,8 +73,8 @@ async def filter_events_for_client(
           * the user is not currently a member of the room, and:
           * the user has not been a member of the room since the given
             events
-        always_include_ids: set of event ids to specifically
-            include (unless sender is ignored)
+        always_include_ids: set of event ids to specifically include, if present
+            in events (unless sender is ignored)
         filter_send_to_client: Whether we're checking an event that's going to be
             sent to a client. This might not always be the case since this function can
             also be called to check whether a user can see the state at a given point.