diff --git a/codex-rs/app-server/src/bespoke_event_handling.rs b/codex-rs/app-server/src/bespoke_event_handling.rs
index 200e155eb0..eda154a4e1 100644
--- a/codex-rs/app-server/src/bespoke_event_handling.rs
+++ b/codex-rs/app-server/src/bespoke_event_handling.rs
@@ -1063,6 +1063,8 @@ pub(crate) async fn apply_bespoke_event_handling(
             };
 
             if let Some(request_id) = pending {
+                // Rollback responses are rebuilt from rollout-on-disk, and `thread/start`
+                // can defer rollout file creation, so force persistence before reading.
                 let rollout_path = match conversation.ensure_rollout_persisted_for_api().await {
                     Ok(RolloutPersistenceStatus::Persisted(path)) => path,
                     Ok(RolloutPersistenceStatus::Ephemeral) => {