diff --git a/api/client-server/definitions/room_event_filter.yaml b/api/client-server/definitions/room_event_filter.yaml
index 35b3edf94..4790643e0 100644
--- a/api/client-server/definitions/room_event_filter.yaml
+++ b/api/client-server/definitions/room_event_filter.yaml
@@ -30,7 +30,12 @@ allOf:
         ``include_redundant_members`` to change this behaviour).
 
         Only applicable when filtering state events, such as the
-        ``state`` section of a ``/sync`` or ``/messages`` response.
+        ``state`` section of a lazy-loading aware endpoint.
+
+        The endpoints which support lazy-loading are:
+        `/sync <#get-matrix-client-%CLIENT_RELEASE_LABEL%-sync>`_,
+        `/messages <#get-matrix-client-%CLIENT_RELEASE_LABEL%-rooms-roomid-messages>`_,
+        and `/context <#get-matrix-client-%CLIENT_RELEASE_LABEL%-rooms-roomid-context-eventid>`_.
     include_redundant_members:
       type: boolean
       description: |-
@@ -45,7 +50,7 @@ allOf:
         is ``false`` this field is ignored.
 
         Only applicable when filtering state events, such as the
-        ``state`` section of a ``/sync`` or ``/messages`` response.
+        ``state`` section of a lazy-loading aware endpoint.
     not_rooms:
       description: A list of room IDs to exclude. If this list is absent then no rooms
         are excluded. A matching room will be excluded even if it is listed in the ``'rooms'``
diff --git a/api/client-server/event_context.yaml b/api/client-server/event_context.yaml
index 91da3cf4f..c0f391e52 100644
--- a/api/client-server/event_context.yaml
+++ b/api/client-server/event_context.yaml
@@ -34,6 +34,9 @@ paths:
         This API returns a number of events that happened just before and
         after the specified event. This allows clients to get the context
         surrounding an event.
+
+        *Note*: this endpoint supports lazy-loading. See `Filtering <#filtering>`_
+        for more information.
       operationId: getEventContext
       security:
         - accessToken: []
diff --git a/api/client-server/message_pagination.yaml b/api/client-server/message_pagination.yaml
index ff6d970db..716afb659 100644
--- a/api/client-server/message_pagination.yaml
+++ b/api/client-server/message_pagination.yaml
@@ -33,6 +33,9 @@ paths:
       description: |-
         This API returns a list of message and state events for a room. It uses
         pagination query parameters to paginate history in the room.
+
+        *Note*: this endpoint supports lazy-loading. See `Filtering <#filtering>`_
+        for more information.
       operationId: getRoomEvents
       security:
         - accessToken: []
@@ -120,7 +123,7 @@ paths:
 
                   Unless ``include_redundant_members`` is ``true``, the server should remove
                   redundant members which would have already been sent to clients in prior calls
-                  to ``/messages`` or ``/sync`` with the same filter.
+                  to lazy-loading aware endpoints with the same filter.
                 items:
                   type: object
                   title: RoomStateEvent
diff --git a/api/client-server/sync.yaml b/api/client-server/sync.yaml
index f204152a0..87e7bf74d 100644
--- a/api/client-server/sync.yaml
+++ b/api/client-server/sync.yaml
@@ -34,6 +34,9 @@ paths:
         Clients use this API when they first log in to get an initial snapshot
         of the state on the server, and then continue to call this API to get
         incremental deltas to the state, and to receive new messages.
+
+        *Note*: this endpoint supports lazy-loading. See `Filtering <#filtering>`_
+        for more information.
       operationId: sync
       security:
         - accessToken: []