diff --git a/data/api/server-server/knocks.yaml b/data/api/server-server/knocks.yaml
index 01bfa637..f0cf69ad 100644
--- a/data/api/server-server/knocks.yaml
+++ b/data/api/server-server/knocks.yaml
@@ -294,9 +294,21 @@ paths:
                     type: array
                     items:
                       $ref: ../../event-schemas/schema/core-event-schema/stripped_state.yaml
+                    x-changedInMatrixVersion:
+                      "1.16": |
+                        `m.room.create` and format requirements were added.
                     description: |-
-                      A list of [stripped state events](/client-server-api/#stripped-state)
-                      to help the initiator of the knock identify the room.
+                      A list of state events to help the initiator of the knock identify
+                      the room. Translated as [stripped state events](/client-server-api/#stripped-state)
+                      over the Client-Server API.
+
+                      MUST contain the `m.room.create` event for the room. All events
+                      listed MUST additionally be formatted according to the room
+                      version specification.
+
+                      Entries which are [improperly signed](/server-server-api/#validating-hashes-and-signatures-on-received-events)
+                      or formatted SHOULD be removed by the server prior to supplying
+                      them over the Client-Server API.
                     example:
                       $ref: ../../event-schemas/examples/knock_room_state.json
                 required:
diff --git a/data/event-schemas/schema/m.room.member.yaml b/data/event-schemas/schema/m.room.member.yaml
index 824d64d9..75510d51 100644
--- a/data/event-schemas/schema/m.room.member.yaml
+++ b/data/event-schemas/schema/m.room.member.yaml
@@ -154,11 +154,15 @@ properties:
               $ref: "core-event-schema/stripped_state.yaml"
             type: array
           knock_room_state:
+            x-changedInMatrixVersion:
+              "1.16": |
+                `m.room.create` was made a required event type for stripped state.
             description: |-
               A subset of the state of the room at the time of the knock, if `membership` is `knock`.
               This has the same restrictions as `invite_room_state`. If they are set on the room, at least
               the state for `m.room.avatar`, `m.room.canonical_alias`, `m.room.join_rules`, `m.room.name`,
-              and `m.room.encryption` SHOULD be included.
+              and `m.room.encryption` SHOULD be included. The `m.room.create` event MUST be included,
+              though MAY be missing if the server hasn't updated to support the Matrix 1.16 specification.
             items:
               $ref: "core-event-schema/stripped_state.yaml"
             type: array