diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55995339e..f2970e64d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,9 +9,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Relanded BLOCKER-4 delegated child-session empty-history fallback. Runtime fallback now consumes the captured bootstrap prompt when a delegated child session fails before history is persisted, while preserving delegated system prompts and tool permissions for the retry.
 - Team Mode fresh-install diagnostics now log the resolved `team_mode` config and tool-registry team tool count, making #3893-style missing `team_*` registrations visible instead of silent.
 - Added a regression test proving a fresh minimal user config with `{ "team_mode": { "enabled": true } }` registers all 12 `team_*` tools.
 
+### Documentation
+
+- Marked the v4.2.0 BLOCKER-4 known issue as resolved in v4.2.1.
+
 ## [4.2.0] - 2026-05-15
 
 ### Added
@@ -43,5 +48,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Delegated child-session early-failure fallback (BLOCKER-4)**: PR #3825's `fac90d69f` was reverted by PR #4044 because its own regression test failed on clean root `bun test`. The delegate-task fallback bug for empty session history remains unaddressed in v4.2.0. Reland targets v4.2.1 once the regression test is stabilized against post-#4032 schema and the new gate semantics. See `docs/reference/known-issues.md` for details and workaround.
 - **First-prompt watchdog supersession history (L16)**: PR #3952 was superseded by PR #4051 (rebased over #4007/factory refactor with `internallyAbortedSessions` threading). The supersession represents conflict resolution, not a feature pivot. The final watchdog logic shipped via #4051 + `a130fa70d` covers subagent first-prompt silence past 90 seconds with cleanup via session.deleted.
 
-[4.2.0]: https://github.com/code-yeongyu/oh-my-openagent/compare/v4.1.2...v4.2.0
 [4.2.1]: https://github.com/code-yeongyu/oh-my-openagent/compare/v4.2.0...HEAD
+[4.2.0]: https://github.com/code-yeongyu/oh-my-openagent/compare/v4.1.2...v4.2.0