diff --git a/packages/cultmesh-ts/README.md b/packages/cultmesh-ts/README.md
index ea67efe3..5a4e73b7 100644
--- a/packages/cultmesh-ts/README.md
+++ b/packages/cultmesh-ts/README.md
@@ -108,6 +108,20 @@ reactive.update(draft => {
 });
 ```
 
+`node.get`, `node.getRequired` and the value `node.put` resolves to return the
+object the node's cache holds, not a copy: two reads of one record return the
+same object. That object belongs to the cache and must not be mutated. Mutating
+it changes what later reads see without writing anything to the store. To
+change a document, build a new value (or use a writer) and put it:
+
+```ts
+const held = station.getRequired(stationStockDocument, "station:starbridge:stock");
+await station.put(stationStockDocument, "station:starbridge:stock", {
+  ...held,
+  availableMissiles: held.availableMissiles - 4,
+});
+```
+
 State pointers are the same kind of managed surface for UI and tools. They can
 advertise source documents, inherit a Verse route when bound, and resolve
 through that Verse without caller-side context plumbing:
diff --git a/packages/cultmesh-ts/test/cultmesh.test.ts b/packages/cultmesh-ts/test/cultmesh.test.ts
index c513503d..99e44a31 100644
--- a/packages/cultmesh-ts/test/cultmesh.test.ts
+++ b/packages/cultmesh-ts/test/cultmesh.test.ts
@@ -3074,6 +3074,24 @@ test("CultMesh TS reads remote RUDP snapshots through document handles", async (
   }
 });
 
+// What ships (F8): a node's reads and puts return the object its cache holds, not a copy, and the README says that object
+// belongs to the cache. The caller's own value is never the one held.
+test("CultMesh TS node reads and puts return the cache's own object", async () => {
+  const node = await CultMesh.startNode(
+    join(await mkdtemp(join(tmpdir(), "cultmesh-ts-held-object-")), "node.ccmp"),
+    { documents: [noteDocument] },
+  );
+  const written = { noteId: "note:held", body: "held" };
+  const put = await node.put(noteDocument, "note:held", written);
+  assert.notEqual(put, written);
+  assert.deepEqual(put, written);
+  assert.equal(node.get(noteDocument, "note:held"), put);
+  assert.equal(node.getRequired(noteDocument, "note:held"), put);
+  assert.equal(node.get(noteDocument, "note:held"), node.get(noteDocument, "note:held"));
+  written.body = "changed by the caller";
+  assert.equal(node.getRequired(noteDocument, "note:held").body, "held");
+});
+
 test("CultMesh TS syncs remote RUDP snapshots into a local node", async () => {
   const connectionId = 0x1020304a;
   const source = await CultMesh.startNode(