diff --git a/packages/element-web-module-api/element-web-module-api.api.md b/packages/element-web-module-api/element-web-module-api.api.md
index c01f2e90fa..38e1e073a4 100644
--- a/packages/element-web-module-api/element-web-module-api.api.md
+++ b/packages/element-web-module-api/element-web-module-api.api.md
@@ -319,7 +319,6 @@ export interface RoomListCustomisations<Room> {
 
 // @alpha
 export interface RoomViewProps {
-    // (undocumented)
     roomId?: string;
 }
 
diff --git a/packages/element-web-module-api/src/api/builtins.ts b/packages/element-web-module-api/src/api/builtins.ts
index 68ab7a39e2..99d60e031f 100644
--- a/packages/element-web-module-api/src/api/builtins.ts
+++ b/packages/element-web-module-api/src/api/builtins.ts
@@ -10,6 +10,9 @@ Please see LICENSE files in the repository root for full details.
  * @alpha Subject to change.
  */
 export interface RoomViewProps {
+    /**
+     * The ID of the room to render.
+     */
     roomId?: string;
 }