diff --git a/packages/element-web-module-api/src/api/extras.ts b/packages/element-web-module-api/src/api/extras.ts
index da29a61ac3..b2d3155d56 100644
--- a/packages/element-web-module-api/src/api/extras.ts
+++ b/packages/element-web-module-api/src/api/extras.ts
@@ -7,20 +7,31 @@ Please see LICENSE files in the repository root for full details.
 
 import { JSX } from "react";
 
-interface SpacePanelItemProps {
-    isPanelCollapsed: boolean;
-}
+/**
+ * Any kind of event that can trigger a button
+ * @alpha
+ */
+export type ButtonEvent = React.MouseEvent<Element> | React.KeyboardEvent<Element> | React.FormEvent<Element>;
 
 /**
  * The type of the function used to render a space panel item.
  * @alpha
  */
-export type SpacePanelItemRenderFunction = (props: SpacePanelItemProps) => JSX.Element;
+export interface SpacePanelItemProps {
+    spaceKey?: string;
+    className?: string;
+    icon?: JSX.Element;
+    label: string;
+    contextMenuTooltip?: string;
+    style?: React.CSSProperties;
+    //notificationState?: NotificationState;
+    onClick?(ev?: ButtonEvent): void;
+}
 
 /**
  * API for inserting extra UI into Element Web.
  * @alpha Subject to change.
  */
 export interface ExtrasApi {
-    addSpacePanelItem(renderer: SpacePanelItemRenderFunction): void;
+    addSpacePanelItem(props: SpacePanelItemProps): void;
 }