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-rw-r--r--synapse/handlers/presence.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 46704c62a0..f714bcb53d 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -984,6 +984,9 @@ def should_notify(old_state, new_state):
 def format_user_presence_state(state, now, include_user_id=True):
     """Convert UserPresenceState to a format that can be sent down to clients
     and to other servers.
+
+    The "user_id" is optional so that this function can be used to format presence
+    updates for client /sync responses and for federation /send requests.
     """
     content = {
         "presence": state.state,