diff --git a/polygerrit-ui/app/models/views/group.ts b/polygerrit-ui/app/models/views/group.ts
index 2ab3735..f4a7c78 100644
--- a/polygerrit-ui/app/models/views/group.ts
+++ b/polygerrit-ui/app/models/views/group.ts
@@ -17,6 +17,10 @@
 
 export interface GroupViewState extends ViewState {
   view: GerritView.GROUP;
+  /**
+   * This refers to the (string) `id` of `GroupInfo`, not the `groupId`, which
+   * is a number.
+   */
   groupId: GroupId;
   detail?: GroupDetailView;
 }