diff --git a/README.md b/README.md
index f5f611f..b7109ec 100644
--- a/README.md
+++ b/README.md
@@ -518,7 +518,7 @@ chat.RuntimeOptions{
 }
 ```
 
-The runtime implements four of the upstream-aligned strategies (ADR 0012):
+The runtime implements all five upstream-aligned strategies (ADR 0012):
 
 - `ConcurrencyDrop` (default): a lock conflict is acknowledged and dropped.
 - `ConcurrencyQueue`: the newest follow-up waits for the in-flight handler;
@@ -529,11 +529,15 @@ The runtime implements four of the upstream-aligned strategies (ADR 0012):
   sharing a state are serialized by the thread lock, not coalesced.
 - `ConcurrencyConcurrent`: no thread lock at all; every event dispatches in its
   own execution, bounded by `MaxConcurrent`.
-
-The remaining ADR 0012 surface — the `burst` strategy and the
-force/steerability (`onLockConflict`) preemption hook — is staged behind the
-deferred-dispatch admission and fenced-coordination design work; the names
-stay reserved.
+- `ConcurrencyBurst`: routed events for a scope collect for a `BurstWindow`,
+  then dispatch as one batch under a single lock hold, each member in join
+  order with its own `DetachTimeout` budget. Requires deferred dispatch.
+  Like queue supersession and debounce coalescing, batching is per runtime
+  instance.
+
+The one remaining ADR 0012 concept — the force/steerability
+(`onLockConflict`) preemption hook — is rejected for v0.x per ADR 0015; the
+names stay reserved behind that ADR's formal-design bar.
 
 `LockScope` chooses what the lock guards: per thread (default) or per channel
 (`LockScopeChannel`) for platforms whose model needs channel-wide ordering.
diff --git a/docs/explanation.md b/docs/explanation.md
index c89839f..155275f 100644
--- a/docs/explanation.md
+++ b/docs/explanation.md
@@ -37,10 +37,10 @@ design deliberately diverges from Vercel Chat SDK.
 | [0009](adr/0009-message-history.md) | Message history stays application-owned; optional storage-free `HistoryReader` | Accepted |
 | [0010](adr/0010-observability.md) | Optional `Observer` seam; no OpenTelemetry in core | Accepted |
 | [0011](adr/0011-resumable-streaming.md) | Resumable streaming deferred from core, not foreclosed | Proposed |
-| [0012](adr/0012-concurrency-strategy.md) | Concurrency strategy expansion (`drop`/`queue`/`debounce`/`concurrent` + lock scope implemented; `burst` and force/steerability staged) | Accepted (staged) |
+| [0012](adr/0012-concurrency-strategy.md) | Concurrency strategy expansion (`drop`/`queue`/`debounce`/`concurrent`/`burst` + lock scope implemented; force/steerability names reserved) | Accepted |
 | [0013](adr/0013-linear-generic-comments.md) | Linear generic issue/comment participation | Accepted |
 | [0014](adr/0014-nats-state-adapter.md) | NATS JetStream state adapter | Accepted |
-| [0015](adr/0015-runtime-coordination.md) | Deferred-dispatch admission bound; cross-instance coalescing rejected for now | Proposed |
+| [0015](adr/0015-runtime-coordination.md) | Deferred-dispatch admission bound; cross-instance coalescing rejected for now | Accepted |
 
 ## The Short Version