diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fa48053c6d..9a0e088cb2a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- ACP/sessions.patch: allow `spawnedBy` and `spawnDepth` lineage fields on ACP session keys so `sessions_spawn` with `runtime: "acp"` no longer fails during child-session setup. Fixes #40971. (#40995) thanks @xaeon2026.
 - macOS/LaunchAgent install: tighten LaunchAgent directory and plist permissions during install so launchd bootstrap does not fail when the target home path or generated plist inherited group/world-writable modes.
 - Gateway/Control UI: keep dashboard auth tokens in session-scoped browser storage so same-tab refreshes preserve remote token auth without restoring long-lived localStorage token persistence, while scoping tokens to the selected gateway URL and fragment-only bootstrap flow. (#40892) thanks @velvet-shark.
 - Models/Kimi Coding: send `anthropic-messages` tools in native Anthropic format again so `kimi-coding` stops degrading tool calls into XML/plain-text pseudo invocations instead of real `tool_use` blocks. (#38669, #39907, #40552) Thanks @opriz.