diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a572a60384..350acd09e9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ Docs: https://docs.openclaw.ai
 - Slack: pass `recipient_team_id` / `recipient_user_id` through Slack native streaming calls so `chat.startStream`/`appendStream`/`stopStream` work reliably across DMs and Slack Connect setups, and disable block streaming when native streaming is active. (#20988) Thanks @Dithilli. Earlier recipient-ID groundwork was contributed in #20377 by @AsserAl1012.
 - CLI/Config: add canonical `--strict-json` parsing for `config set` and keep `--json` as a legacy alias to reduce help/behavior drift. (#21332) thanks @adhitShet.
 - CLI: keep `openclaw -v` as a root-only version alias so subcommand `-v, --verbose` flags (for example ACP/hooks/skills) are no longer intercepted globally. (#21303) thanks @adhitShet.
+- Config/Memory: restore schema help/label metadata for hybrid `mmr` and `temporalDecay` settings so configuration surfaces show correct names and guidance. (#18786) Thanks @rodrigouroz.
 
 - Discord/Gateway: handle close code 4014 (missing privileged gateway intents) without crashing the gateway. Thanks @thewilloftheshadow.
 - Security/Net: strip sensitive headers (`Authorization`, `Proxy-Authorization`, `Cookie`, `Cookie2`) on cross-origin redirects in `fetchWithSsrFGuard` to prevent credential forwarding across origin boundaries. (#20313) Thanks @afurm.
diff --git a/src/config/schema.help.ts b/src/config/schema.help.ts
index 1c2356c3df1..f280e634c66 100644
--- a/src/config/schema.help.ts
+++ b/src/config/schema.help.ts
@@ -215,6 +215,14 @@ export const FIELD_HELP: Record<string, string> = {
     "Weight for BM25 text relevance when merging results (0-1).",
   "agents.defaults.memorySearch.query.hybrid.candidateMultiplier":
     "Multiplier for candidate pool size (default: 4).",
+  "agents.defaults.memorySearch.query.hybrid.mmr.enabled":
+    "Enable MMR re-ranking to reduce near-duplicate memory hits (default: false).",
+  "agents.defaults.memorySearch.query.hybrid.mmr.lambda":
+    "MMR relevance/diversity balance (0 = max diversity, 1 = max relevance, default: 0.7).",
+  "agents.defaults.memorySearch.query.hybrid.temporalDecay.enabled":
+    "Enable exponential recency decay for hybrid scoring (default: false).",
+  "agents.defaults.memorySearch.query.hybrid.temporalDecay.halfLifeDays":
+    "Half-life in days for temporal decay (default: 30).",
   "agents.defaults.memorySearch.cache.enabled":
     "Cache chunk embeddings in SQLite to speed up reindexing and frequent updates (default: true).",
   memory: "Memory backend configuration (global).",
diff --git a/src/config/schema.labels.ts b/src/config/schema.labels.ts
index b7625889693..8a1e45a5640 100644
--- a/src/config/schema.labels.ts
+++ b/src/config/schema.labels.ts
@@ -166,6 +166,11 @@ export const FIELD_LABELS: Record<string, string> = {
   "agents.defaults.memorySearch.query.hybrid.textWeight": "Memory Search Text Weight",
   "agents.defaults.memorySearch.query.hybrid.candidateMultiplier":
     "Memory Search Hybrid Candidate Multiplier",
+  "agents.defaults.memorySearch.query.hybrid.mmr.enabled": "Memory Search MMR Re-ranking",
+  "agents.defaults.memorySearch.query.hybrid.mmr.lambda": "Memory Search MMR Lambda",
+  "agents.defaults.memorySearch.query.hybrid.temporalDecay.enabled": "Memory Search Temporal Decay",
+  "agents.defaults.memorySearch.query.hybrid.temporalDecay.halfLifeDays":
+    "Memory Search Temporal Decay Half-life (Days)",
   "agents.defaults.memorySearch.cache.enabled": "Memory Search Embedding Cache",
   "agents.defaults.memorySearch.cache.maxEntries": "Memory Search Embedding Cache Max Entries",
   memory: "Memory",