diff --git a/README.md b/README.md
index db4fb75..42efd36 100644
--- a/README.md
+++ b/README.md
@@ -91,7 +91,7 @@ Session tokens are how your browser stays logged in. This tool uses them to acce
 
 | Provider | Cookie Name | Lifetime | Expiry Detection |
 |----------|-------------|----------|-----------------|
-| ChatGPT | `__Secure-next-auth.session-token` | ~7 days | JWT `exp` claim (decoded automatically) |
+| ChatGPT | `__Secure-next-auth.session-token.0` + `.1` | ~7 days | JWT `exp` claim (decoded automatically) |
 | Claude | `sessionKey` | ~30 days | Only detectable via 401 response |
 
 ### Finding Tokens in Chrome DevTools
@@ -102,7 +102,11 @@ Session tokens are how your browser stays logged in. This tool uses them to acce
 4. In the left panel, expand **Cookies** and click the site URL
 5. Find the cookie by name and copy its **Value**
 
-**ChatGPT:** go to `https://chatgpt.com` → find `__Secure-next-auth.session-token` → copy Value (starts with `eyJ`)
+**ChatGPT:** go to `https://chatgpt.com` → find **two** cookies:
+- `__Secure-next-auth.session-token.0` — copy Value (starts with `eyJ`) → `CHATGPT_SESSION_TOKEN`
+- `__Secure-next-auth.session-token.1` — copy Value → `CHATGPT_SESSION_TOKEN_1`
+
+ChatGPT splits large session tokens across two cookies to stay under the browser's 4KB cookie limit. Both are required.
 
 **Claude:** go to `https://claude.ai` → find `sessionKey` → copy Value
 
@@ -138,7 +142,8 @@ cp .env.example .env
 
 | Variable | Description |
 |----------|-------------|
-| `CHATGPT_SESSION_TOKEN` | Your ChatGPT JWT session token (`eyJ…`) |
+| `CHATGPT_SESSION_TOKEN` | ChatGPT session token chunk `.0` (starts with `eyJ…`) |
+| `CHATGPT_SESSION_TOKEN_1` | ChatGPT session token chunk `.1` (the remainder) |
 | `CHATGPT_PROJECT_IDS` | Comma-separated ChatGPT project IDs (see below) |
 | `CLAUDE_SESSION_KEY` | Your Claude session key |