diff --git a/README.md b/README.md
index 0d54018..521de6b 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Your home's energy, from wherever you are.
 
 This is FTW's installable web client. It talks to the FTW box in your home,
 which is the authority on your
-energy system. Sourceful's cloud carries the traffic and cannot read it.
+energy system. Sourceful's relay carries the traffic and cannot read it.
 
 ## Product direction and contributions
 
@@ -50,12 +50,17 @@ cached projection of it, never the original.
 on screen in the first frame, timestamped honestly, while fresher data is
 fetched behind them. There is no spinner on a white background.
 
-**The cloud is blind.** It serves this bundle, relays encrypted frames and
-knows which opaque handle is online. It cannot read a watt, a device name or
-a command. This is enforced by the protocol, and a CI test dumps the relay's
-database and fails if anything recognisable is in it.
+**The relay is blind.** Sourceful serves this bundle, and its relay carries
+encrypted frames and knows which opaque handle is online. The relay cannot read
+a watt, a device name or a command. This is enforced by the protocol, and a CI
+test dumps the relay's database and fails if anything recognisable is in it.
 
-If a household asks, the cloud will also hold one sealed copy of its home, so a
+This app does not use FTW Cloud. FTW Cloud is a separate service for the
+iPhone app, proposed and not yet built. If a box owner turns it on, Sourceful
+can read what the owner enabled; it never sends control.
+[ADR 0008](https://github.com/srcfl/ftw/blob/master/docs/adr/0008-ftw-cloud.md) records it, and the relay and escrow stay blind either way.
+
+If a household asks, the escrow will also hold one sealed copy of its home, so a
 new phone gets back in with a passkey instead of a trip to the box. Sourceful
 holds a sealed copy it cannot open, with an opaque id and nothing beside it —
 [`escrow/README.md`](escrow/README.md) is the claim, the file of fixed slots it
diff --git a/docs/architecture.md b/docs/architecture.md
index e132a0e..759ecbe 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -36,6 +36,11 @@ Sourceful's cloud serves this bundle and relays encrypted frames. On that path
 it knows that an opaque handle is online and roughly how much traffic passed.
 It cannot read a watt, a device name or a command.
 
+FTW Cloud is a separate service for the iPhone app, proposed in
+[srcfl/ftw ADR 0008](https://github.com/srcfl/ftw/blob/master/docs/adr/0008-ftw-cloud.md) and not yet built. If a box owner turns it on, it
+holds a readable copy of what the owner enabled, and it never sends control.
+This app does not use it. The relay and escrow stay blind either way.
+
 A separate daily fleet-report endpoint is the stated exception. Unless the box
 owner opts out, it receives six coarse labels with no box id and reduces them
 to UTC-day counters on arrival. It keeps neither the report nor the source
@@ -209,9 +214,11 @@ home. The mitigations are an append-only build transparency log, a service
 worker that refuses a bundle whose hash is not in it, no third-party scripts
 and no analytics. They reduce the risk; they do not remove it.
 
-So the claim is **"Sourceful's services cannot decrypt your energy data"** —
-not "it is mathematically impossible for Sourceful to ever access anything".
-The second sentence is marketing. The first is true.
+So the claim is **"Sourceful's relay and escrow cannot decrypt your energy
+data"** — not "it is mathematically impossible for Sourceful to ever access
+anything". The second sentence is marketing. The first is true. It does not
+cover FTW Cloud, which can read what a box owner turns on;
+[ADR 0008](https://github.com/srcfl/ftw/blob/master/docs/adr/0008-ftw-cloud.md) states that service's own claim.
 
 ### What is not yet true
 
diff --git a/relay/README.md b/relay/README.md
index 4bb0315..044517a 100644
--- a/relay/README.md
+++ b/relay/README.md
@@ -1,7 +1,10 @@
 # The blind relay
 
 Carries encrypted frames between an FTW box and the browsers allowed to see it.
-It is the only remote path between the two, and it cannot read a watt.
+It is the only remote path that carries commands, and it cannot read a watt.
+FTW Cloud, which a box owner may turn on for the iPhone app, is a separate
+service that can read what the owner enabled. It never touches the relay
+([ADR 0008](https://github.com/srcfl/ftw/blob/master/docs/adr/0008-ftw-cloud.md)).
 
 ```
 box ──ws──▶ ┌────────────┐ ◀──ws── phone
diff --git a/tests/cloud-claims.test.ts b/tests/cloud-claims.test.ts
new file mode 100644
index 0000000..6b9a390
--- /dev/null
+++ b/tests/cloud-claims.test.ts
@@ -0,0 +1,66 @@
+/* What Sourceful can read, said the same way everywhere it is said.
+ *
+ * Until FTW Cloud, "Sourceful cannot read your data" was true of every
+ * Sourceful service this app touches. FTW Cloud (srcfl/ftw ADR 0008) is a
+ * separate service for the iPhone app, and it can read what a box owner turns
+ * on. The relay and the escrow are as blind as before, so their claims stand.
+ * A sentence that says "Sourceful's services" or "the cloud" without naming
+ * them now claims more than is true.
+ *
+ * Nothing goes red when a document goes stale, so this file reads them. Two
+ * rules, both mechanical:
+ *
+ *   1. The broad sentences are gone. No document says that Sourceful's
+ *      services, or the cloud as a whole, cannot read the data.
+ *   2. Every document that tells a reader what Sourceful cannot read also
+ *      names FTW Cloud and links the ADR, so the exception sits beside the
+ *      claim.
+ */
+
+import { describe, it, expect } from 'vitest'
+import { readFileSync } from 'node:fs'
+import { join } from 'node:path'
+
+// From the project root, which is where vitest runs.
+const read = (path: string) =>
+  readFileSync(join(process.cwd(), path), 'utf8').replace(/\s+/g, ' ')
+
+/** The documents that tell a reader what Sourceful can and cannot read. */
+const DOCS = ['README.md', 'docs/architecture.md', 'relay/README.md']
+
+/** The sentences that were true before FTW Cloud and are too broad now. */
+const BROAD = [
+  /Sourceful's services cannot decrypt/i,
+  /Sourceful's cloud carries the traffic and cannot read it/i,
+  /\bthe cloud is blind\b/i,
+  /only remote path between the two/i,
+]
+
+const ADR = 'srcfl/ftw/blob/master/docs/adr/0008-ftw-cloud.md'
+
+describe('what Sourceful can read', () => {
+  for (const path of DOCS) {
+    it(`${path} claims nothing broader than the relay and escrow`, () => {
+      const text = read(path)
+      for (const pattern of BROAD) {
+        expect(text, `${path} still says ${pattern}`).not.toMatch(pattern)
+      }
+    })
+
+    it(`${path} names FTW Cloud beside its claim`, () => {
+      const text = read(path)
+      expect(
+        text,
+        `${path} no longer says what Sourceful cannot read; if that is on purpose, drop it from DOCS`
+      ).toMatch(/cannot (read|decrypt)/i)
+      expect(text, `${path} makes the claim without naming the exception`).toContain('FTW Cloud')
+      expect(text, `${path} names FTW Cloud without linking the decision`).toContain(ADR)
+    })
+  }
+
+  it('states the claim for the relay and the escrow by name', () => {
+    expect(read('docs/architecture.md')).toContain(
+      `**"Sourceful's relay and escrow cannot decrypt your energy data"**`
+    )
+  })
+})
diff --git a/tests/relay-blindness.test.ts b/tests/relay-blindness.test.ts
index e59c56a..66bbed1 100644
--- a/tests/relay-blindness.test.ts
+++ b/tests/relay-blindness.test.ts
@@ -3,7 +3,8 @@
 /* The proof.
  *
  * docs/architecture.md makes one claim about the cloud that is architecture
- * rather than policy: "Sourceful's services cannot decrypt your energy data."
+ * rather than policy: "Sourceful's relay and escrow cannot decrypt your energy
+ * data." This file proves the relay half of it.
  * This file is what that sentence is worth. It runs a real box against a real
  * app across a real relay, collects everything the relay touched — every byte
  * routed, every line logged, everything held in memory — and fails if anything