diff --git a/src/apps/notes/index.tsx b/src/apps/notes/index.tsx
index 444dedb..bb521be 100644
--- a/src/apps/notes/index.tsx
+++ b/src/apps/notes/index.tsx
@@ -334,7 +334,6 @@ function ThreadNode({
     <div
       role="treeitem"
       aria-level={depth}
-      aria-setsize={-1}
       aria-expanded={node.children.length > 0 ? true : undefined}
       className={cn(
         !isRootReply &&
diff --git a/src/components/nostr/NoteCard.tsx b/src/components/nostr/NoteCard.tsx
index 4dcddc0..889fde3 100644
--- a/src/components/nostr/NoteCard.tsx
+++ b/src/components/nostr/NoteCard.tsx
@@ -74,8 +74,8 @@ export function NoteCard({ event, compact, onReply, replyOpen, className }: Note
                 size="sm"
                 className="h-7 gap-1.5 px-2 text-xs text-muted-foreground"
                 onClick={() => onReply(event)}
-                aria-expanded={replyOpen}
-                aria-controls={replyOpen ? 'reply-composer' : undefined}
+                aria-expanded={!!replyOpen}
+                aria-controls="reply-composer"
               >
                 <MessageSquareReply className="size-3.5" aria-hidden />
                 Reply
diff --git a/src/lib/nostrUtils.ts b/src/lib/nostrUtils.ts
index eb3d192..d4e02ee 100644
--- a/src/lib/nostrUtils.ts
+++ b/src/lib/nostrUtils.ts
@@ -144,7 +144,7 @@ export interface ReplyNode {
   children: ReplyNode[];
   /** True when the event landed here as a fallback, not via its NIP-10 tags. */
   misplaced: boolean;
-  /** Depth of the cycle this event is part of, when its chain loops. */
+  /** Whether this event's chain loops back on itself. */
   cycle?: boolean;
 }