diff --git a/README.md b/README.md
index 34d1d6d..7fe1257 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,13 @@
-# TurtleMail - WoW 1.12 addOn
+# TurtleMail - WoW 1.12 / Turtle WoW
+
+This fork keeps the original TurtleMail features while adding a small compatibility layer for **Turtle WoW 1.18.x / Octo**.
+
+> Current test build: **1.4.6-compat.1**  
+> Based on upstream **sica42/TurtleMail 1.4.5**.  
+> The compatibility work is isolated in `TurtleMailFix.lua` so upstream changes remain easy to compare and merge.
+
+## Features
 
-An extension to the Blizzard mail interface which
 - **Automatically opens mail, very rapidly**
 - **Mails multiple items at once, very rapidly**
 - **Autocompletes recipient names**
@@ -15,8 +22,38 @@ An extension to the Blizzard mail interface which
 
 Note that COD is always ignored when opening, both automatically as well as by **\<Right Click>**.
 
-Logging is disabled by default. Enable with `/tm log` command
+Logging is disabled by default. Enable with `/tm log`.
 
-![Alt text](https://i.imgur.com/H0MUmXd.png)
+## Turtle WoW compatibility fixes
 
-![Alt text](https://i.imgur.com/LM7tRcx.png)
+`1.4.6-compat.1` currently addresses:
+
+- `MailHorizontalBarLeft` / `MailHorizontalBarRight` nil crashes.
+- Missing or malformed `TurtleMail_AutoCompleteNames` SavedVariables.
+- Broken learning of sender names for autocomplete.
+- Sent-money logging not being recorded correctly.
+- Inbox index/COD nil safety during automatic opening.
+- Stale AH/returned icons on empty inbox rows.
+- Fragile mailbox/package-frame lookups.
+- A calendar tooltip nil/stale-value edge case.
+
+See [`AUDIT.md`](AUDIT.md) for the full audit, remaining architectural risks, and the in-game validation checklist.
+
+## Test status
+
+This is intentionally marked as a **test build** until it has been validated in-game on Turtle WoW 1.18.x. Core mail sending/opening behavior has not been deliberately redesigned; the patch focuses on compatibility and safety around the upstream implementation.
+
+Recommended checks after installing:
+
+1. Open/close the mailbox repeatedly.
+2. Test normal mail, item mail, gold, AH, returned mail, and COD.
+3. Test one-item and multi-item sends.
+4. Test recipient autocomplete.
+5. Test the sent/received log.
+6. If you use pfUI, test with its mailbox skin enabled and disabled.
+
+## Screenshots
+
+![TurtleMail](https://i.imgur.com/H0MUmXd.png)
+
+![TurtleMail](https://i.imgur.com/LM7tRcx.png)