Add some words about where the filter is applied
@@ -64,8 +64,10 @@ paths:
type: string
description: |-
A JSON ``RoomEventFilter`` to filter the returned events with. The
- filter may be applied before or/and after the ``limit`` parameter -
- whichever the homeserver prefers.
+ filter is only applied to ``events_before``, ``events_after``, and
+ ``state``. It is not applied to the ``event`` itself. The filter may
+ be applied before or/and after the ``limit`` parameter - whichever the
+ homeserver prefers.
See `Filtering <#filtering>`_ for more information.
x-example: "66696p746572"
