diff --git a/frontend/src/lib/components/chronik/ChronikRow.svelte.spec.ts b/frontend/src/lib/components/chronik/ChronikRow.svelte.spec.ts
index 76ac3810..c95e761b 100644
--- a/frontend/src/lib/components/chronik/ChronikRow.svelte.spec.ts
+++ b/frontend/src/lib/components/chronik/ChronikRow.svelte.spec.ts
@@ -174,6 +174,18 @@ describe('ChronikRow', () => {
 		expect(link).not.toBeNull();
 	});
 
+	it('links to commentId-only URL when commentId is set but annotationId is absent', async () => {
+		const item: ActivityFeedItemDTO = {
+			...baseItem,
+			kind: 'COMMENT_ADDED',
+			commentId: 'comment-7'
+			// annotationId absent — comment on a non-annotation block
+		};
+		render(ChronikRow, { item });
+		const link = document.querySelector('a[href="/documents/doc-1?commentId=comment-7"]');
+		expect(link).not.toBeNull();
+	});
+
 	// --- robustness: title rendering for edge cases ---
 	it('still renders the row link when documentTitle is an empty string', async () => {
 		// Felix: verbText.indexOf(docTitle) returned 0 for empty titles — the span