diff --git a/README.md b/README.md
index 4e7edfd..4abfd2e 100644
--- a/README.md
+++ b/README.md
@@ -28,60 +28,16 @@ This, and only this:
## How Mailsuite works, and why deleting this is safe
Their extension is a thin client. The tracking happens on **their server**, not
-in your browser. When you compose, it slips two separate things into the email:
+in your browser, and the watermark plays no part in it.
-```text
- your email body
- ┌──────────────────────────────────────┐
- │ Hi Bob, here's the doc. │ <- you wrote this
- │ │
- │ │ invisible, does all the work
- │ │
- │
│ <- THE WATERMARK
- │ Sent with Mailtrack │ visible, does nothing
- │
│ it is an advert
- └──────────────────────────────────────┘
-```
-
-Then the loop that actually gives you read receipts:
-
-```text
- 1 you hit send
- |
- v
- 2 Gmail mails the HTML, pixel included
- |
- v
- 3 Bob opens it. his mail client loads
- that 1x1 image from mailsuite.com
- |
- v
- 4 their server logs "hash a3f9 = opened"
- |
- v
- 5 your Mailsuite extension polls
- /trace/2/status and paints the ticks
-```
+
The watermark appears nowhere in that loop. It is an advert sitting in the
message body. Removing it changes nothing about steps 1 through 5.
-## Where this extension sits
-
-It does not modify, patch or replace Mailsuite. Both run side by side:
-
-```text
- Mailsuite ──► injects [ pixel ] + [ watermark ]
- │ │
- MailSuiteFree ──► deletes ────┼────────────┘
- │
- pixel untouched
- tracking loop intact
-```
-
-Everything of theirs carries on: read receipts, notifications, the dashboard,
-campaigns, link tracking. You lose the advert and nothing else.
+This extension does not modify, patch or replace Mailsuite. Both run side by
+side, and everything of theirs carries on: read receipts, notifications, the
+dashboard, campaigns, link tracking. You lose the advert and nothing else.
## Install
@@ -185,12 +141,47 @@ test/ fixtures, including real transcribed markup
The split exists so the part that decides what gets deleted out of your email
can be tested without a browser.
-## Before you rely on any of this
+## Try their own Remove button first
+
+Mailsuite renders a Remove control inside the signature. Whether it sticks
+depends on which signature variant your account was assigned, which is decided
+server side. From `kA()`, the click handler, in `gmail.end.bundle.js`:
+
+```text
+ variant 17 or 18 ──► dialog, then on confirm:
+ POST /settings/update/signature
+ { signatureEnabled: false }
+ persists on your account. permanent.
+
+ variant 11 to 16 ──► strips it from this one email only,
+ and shows the upgrade modal unless your
+ account carries the disableSignature
+ permission
+```
+
+So **if you are on variant 17 or 18, click Remove once and you are done.** You
+do not need this extension at all. Check
+`document.querySelector('[data-signature-version]')` in the Gmail console to see
+which you have.
+
+If you are on 11 to 16, their button is per-email and may nag, which is what
+this extension is for.
+
+### Why this extension does not just click their button for you
+
+Considered and rejected, see [#3](../../issues/3):
+
+- It only truly persists on two of the eight variants, and the variant is not
+ ours to choose.
+- On the others it can trigger the upgrade modal on every send.
+- The persisting path is a **server call that changes an account setting**.
+ A local extension quietly flipping a setting on your Mailsuite account is a
+ much bigger action than deleting a node from a draft, and a much ruder
+ surprise if you did not expect it.
-Mailsuite already ships its own opt-out, *"Don't add the Mailsuite signature to
-my emails"*, in its signature settings. It also renders a Remove button inside
-the signature itself. If either sticks for you, you do not need this extension.
-Worth thirty seconds to check first.
+Deleting the `
` locally does the same visible job, works on every variant,
+touches nothing on their servers, and stops the moment you switch the extension
+off.
## Licence
diff --git a/docs/how-it-works.svg b/docs/how-it-works.svg
new file mode 100644
index 0000000..9e3168a
--- /dev/null
+++ b/docs/how-it-works.svg
@@ -0,0 +1,69 @@
+
diff --git a/src/popup.html b/src/popup.html
index c2b5d71..01be186 100644
--- a/src/popup.html
+++ b/src/popup.html
@@ -79,7 +79,13 @@
│ invisible, does all the work
- │ │
- │