diff --git a/event-schemas/schema/core-event-schema/state_event.yaml b/event-schemas/schema/core-event-schema/state_event.yaml
index 020e9087..37d4426f 100644
--- a/event-schemas/schema/core-event-schema/state_event.yaml
+++ b/event-schemas/schema/core-event-schema/state_event.yaml
@@ -1,19 +1,7 @@
 allOf:
 - $ref: room_event.yaml
+- $ref: sync_state_event.yaml
 description: In addition to the Room Event fields, State Events have the following
   additional fields.
-properties:
-  prev_content:
-    description: Optional. The previous ``content`` for this event. If there is no
-      previous content, this key will be missing.
-    title: EventContent
-    type: object
-  state_key:
-    description: A unique key which defines the overwriting semantics for this piece
-      of room state. This value is often a zero-length string. The presence of this
-      key makes this event a State Event. The key MUST NOT start with '_'.
-    type: string
-required:
-- state_key
 title: State Event
 type: object
diff --git a/event-schemas/schema/core-event-schema/sync_room_event.yaml b/event-schemas/schema/core-event-schema/sync_room_event.yaml
index 300dfb2b..fbbf154f 100644
--- a/event-schemas/schema/core-event-schema/sync_room_event.yaml
+++ b/event-schemas/schema/core-event-schema/sync_room_event.yaml
@@ -26,8 +26,7 @@ properties:
     description: The globally unique event identifier.
     type: string
   sender:
-    description: Contains the fully-qualified ID of the user who *sent*
-      this event.
+    description: Contains the fully-qualified ID of the user who sent this event.
     type: string
   origin_server_ts:
     description: Timestamp in milliseconds on originating homeserver
diff --git a/event-schemas/schema/core-event-schema/sync_state_event.yaml b/event-schemas/schema/core-event-schema/sync_state_event.yaml
index a073caac..30af9698 100644
--- a/event-schemas/schema/core-event-schema/sync_state_event.yaml
+++ b/event-schemas/schema/core-event-schema/sync_state_event.yaml
@@ -27,7 +27,7 @@ properties:
   state_key:
     description: A unique key which defines the overwriting semantics for this piece
       of room state. This value is often a zero-length string. The presence of this
-      key makes this event a State Event. The key MUST NOT start with '_'.
+      key makes this event a State Event.
     type: string
 required:
 - state_key