diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a953da91a9..a10b6c517b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - fix(device-pairing): validate callerScopes against resolved token scopes on repair [AI]. (#72925) Thanks @pgondhi987.
+- Active Memory docs: document the `cacheTtlMs` 1000-120000 ms range and 15000 ms default so setup snippets do not lead users past the schema limit. Fixes #65708. (#65737) Thanks @WuKongAI-CMU.
 - fix(agents): canonicalize provider aliases in byProvider tool policy lookup [AI]. (#72917) Thanks @pgondhi987.
 - fix(security): block npm_execpath injection from workspace .env [AI-assisted]. (#73262) Thanks @pgondhi987.
 - Tools/web_fetch: decode response bodies from raw bytes using declared HTTP, XML, or HTML meta charsets before extraction, so Shift_JIS and other legacy-charset pages no longer return mojibake. Fixes #72916. Thanks @amknight.
diff --git a/docs/concepts/active-memory.md b/docs/concepts/active-memory.md
index db62ce65e01..4e971b735e8 100644
--- a/docs/concepts/active-memory.md
+++ b/docs/concepts/active-memory.md
@@ -578,14 +578,14 @@ The most important fields are:
 
 Useful tuning fields:
 
-| Key                           | Type     | Meaning                                                       |
-| ----------------------------- | -------- | ------------------------------------------------------------- |
-| `config.maxSummaryChars`      | `number` | Maximum total characters allowed in the active-memory summary |
-| `config.recentUserTurns`      | `number` | Prior user turns to include when `queryMode` is `recent`      |
-| `config.recentAssistantTurns` | `number` | Prior assistant turns to include when `queryMode` is `recent` |
-| `config.recentUserChars`      | `number` | Max chars per recent user turn                                |
-| `config.recentAssistantChars` | `number` | Max chars per recent assistant turn                           |
-| `config.cacheTtlMs`           | `number` | Cache reuse for repeated identical queries                    |
+| Key                           | Type     | Meaning                                                                            |
+| ----------------------------- | -------- | ---------------------------------------------------------------------------------- |
+| `config.maxSummaryChars`      | `number` | Maximum total characters allowed in the active-memory summary                      |
+| `config.recentUserTurns`      | `number` | Prior user turns to include when `queryMode` is `recent`                           |
+| `config.recentAssistantTurns` | `number` | Prior assistant turns to include when `queryMode` is `recent`                      |
+| `config.recentUserChars`      | `number` | Max chars per recent user turn                                                     |
+| `config.recentAssistantChars` | `number` | Max chars per recent assistant turn                                                |
+| `config.cacheTtlMs`           | `number` | Cache reuse for repeated identical queries (range: 1000-120000 ms; default: 15000) |
 
 ## Recommended setup