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-rw-r--r--docs/presence_router_module.md6
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/presence_router_module.md b/docs/presence_router_module.md
index d6566d978d..d2844915df 100644
--- a/docs/presence_router_module.md
+++ b/docs/presence_router_module.md
@@ -28,7 +28,11 @@ async def ModuleApi.send_local_online_presence_to(users: Iterable[str]) -> None
 which can be given a list of local or remote MXIDs to broadcast known, online user
 presence to (for those users that the receiving user is considered interested in). 
 It does not include state for users who are currently offline, and it can only be
-called on workers that support sending federation.
+called on workers that support sending federation. Additionally, this method must
+only be called from the process that has been configured to write to the
+the [presence stream](https://github.com/matrix-org/synapse/blob/master/docs/workers.md#stream-writers).
+By default, this is the main process, but another worker can be configured to do
+so.
 
 ### Module structure