diff --git a/src/components/views/settings/tabs/room/SecurityRoomSettingsTab.tsx b/src/components/views/settings/tabs/room/SecurityRoomSettingsTab.tsx
index cd40761150..3beb329dc1 100644
--- a/src/components/views/settings/tabs/room/SecurityRoomSettingsTab.tsx
+++ b/src/components/views/settings/tabs/room/SecurityRoomSettingsTab.tsx
@@ -27,6 +27,7 @@ import SettingsStore from "../../../../../settings/SettingsStore";
 import {UIFeature} from "../../../../../settings/UIFeature";
 import { replaceableComponent } from "../../../../../utils/replaceableComponent";
 
+// Knock and private are reserved keywords which are not yet implemented.
 enum JoinRule {
     Public = "public",
     Knock = "knock",