diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05c1b0a8748..c9fd58671ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,7 +38,7 @@ Docs: https://docs.openclaw.ai
 - Control UI/chat: show inline feedback when local slash-command dispatch is unavailable or fails unexpectedly instead of clearing the composer silently. Fixes #52105. Thanks @MooreQiao.
 - Memory/markdown: replace CRLF managed blocks in place and collapse duplicate marker blocks without rewriting unmanaged markdown, so Dreaming and Memory Wiki files self-heal from repeated generated sections. Fixes #75491; supersedes #75495, #75810, and #76008. Thanks @asaenokkostya-coder, @ottodeng, @everettjf, and @lrg913427-dot.
 - Agents/tools: return critical tool-loop circuit-breaker stops as blocked tool results instead of thrown tool failures, so models see the guardrail and stop retrying the same call. Thanks @rayraiser.
-- Agents/sessions: preserve pre-existing runtime model and context window after heartbeat turns so a per-run heartbeat model override does not bleed into shared-session status. Fixes #75452. Thanks @zhang-guiping.
+- Agents/sessions: preserve pre-existing runtime model and context window after heartbeat turns so a per-run heartbeat model override does not bleed into shared-session status. Fixes #75452. Thanks @zhangguiping-xydt.
 - Model commands: clarify direct and inline `/model` acknowledgements for non-default selections as session-scoped. Thanks @addu2612.
 - Doctor/gateway: stop warning that non-existent, unconfigured user-bin directories are required in the Gateway service PATH. Fixes #76017. Thanks @xiphis.
 - TUI/chat: skip full provider model normalization during context-window warmup while preserving provider-owned context metadata, avoiding cold-start stalls with large model registries. Thanks @547895019.
diff --git a/docs/gateway/heartbeat.md b/docs/gateway/heartbeat.md
index bd357f1adf7..7c1630d20ab 100644
--- a/docs/gateway/heartbeat.md
+++ b/docs/gateway/heartbeat.md
@@ -479,9 +479,9 @@ Heartbeats run full agent turns. Shorter intervals burn more tokens. To reduce c
 
 ## Context overflow after heartbeat
 
-If a heartbeat uses a smaller local model, for example an Ollama model with a 32k window, and the next main-session turn reports context overflow, check whether the previous heartbeat left the session on the heartbeat model. OpenClaw's reset message calls this out when the last runtime model matches configured `heartbeat.model`.
+If a heartbeat previously left an existing session on a smaller local model, for example an Ollama model with a 32k window, and the next main-session turn reports context overflow, reset the session runtime model back to the configured primary model. OpenClaw's reset message calls this out when the last runtime model matches configured `heartbeat.model`.
 
-Use `isolatedSession: true` to run heartbeats in a fresh session, combine it with `lightContext: true` for the smallest prompt, or choose a heartbeat model with a context window large enough for the shared session.
+Current heartbeats preserve the shared session's existing runtime model after the run completes. You can still use `isolatedSession: true` to run heartbeats in a fresh session, combine it with `lightContext: true` for the smallest prompt, or choose a heartbeat model with a context window large enough for the shared session.
 
 ## Related